Aw: Re: Handling java streams..
Hi, Am Montag, 27. Juni 2011 23:50:52 UTC+2 schrieb Ken Wesson: a) it isn't found by searching the docs in many of the usual ways; Is that really so hard? http://clojure.github.com/clojure top-right TOC: clojure.java.io If I look for stream handling, wouldn't that sound interesting? Sadly the mind-reading documentation site is not ready, yet. Until then I recommend to read (and experiment with) one or two random functions from the reference every day. In that way you (not you, Ken. you in general the newbie) get an overview and get familiar with the docs. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Mocking framework
Hi, I'm currently working on my first real Clojure project, and I find myself wanting a mocking tool. So I was wondering what you are using? I tried googling, but I can't seem to find the Mockito of the clojure world. Searching for a mocking tool in Clojure it looks like there is a lot of small tools being thrown together, but maybe not being used by many? The one exception maybe is https://github.com/marick/Midje? Thanks, Erik. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: struct sharing same key?
Hi,
maybe Ken's solution needs some clarification
1. Use a map, not a struct. defstruct is kinda deprecated.
2. Use a keyword (preceded by a colon) to code the nationality. A keyword
is created only once and won't consume any more memory if you use it
repeatedly. I'm not sure whether you want to save the memory or the
repeated typing.
3. Ken bundled all persons in the map by language. This may be the right
solution for you or not. But if you do so, note that the inner maps reside
in a vector (square brackets)
Maybe something like this:
;; a function returning a map representing a person
(defn make-person [nationality first last]
{:first first :last last :nationality nationality})
;; the data on which you base the creation of persons
;; This repeats the keyword for each person
(def persons-data
[[:english Jim Silvester]
[:english Stephen Howards]
[:chinese ChiuChiu]])
;; combine the fn and the data
(def persons
(into [] (map #(apply make-person %) persons-data)))
;; A second way of storing your data uses (almost) the representation
suggested by Ken:
(def persons-data-2
{:english [[Jim Silvester]
[Stephen Howards]]
:chinese [ChiuChiu]})
;; This can be turned into a seq of persons like this
(def persons-2
(map
(fn [natio names]; can't use #() because it doesn't nest
(map (fn [[first last]]; note the destructuring
(make-person natio first last))
names))
persons-data-2))
Hope this helps,
Stefan
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Re: [ANN] emacs-clojure-vagrant: a sane development virtual environment
Justin, Sorry about the missing link. Github upload had some issues with Chrome and hence took a while for me to update the latest jark-0.3 binary. It is up now: https://github.com/downloads/icylisper/jark/jark-0.3 -- isaac http://icylisper.in -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Mocking framework
Hi Erik, Take a closer look at Midje, especially https://github.com/marick/Midje/wiki/Metaconstants I'm not an subject matter expert but to me it's close enough to mocking/stubbing. Cheers, Ola Erik Bakstad skrev 2011-06-28 08:56: Hi, I'm currently working on my first real Clojure project, and I find myself wanting a mocking tool. So I was wondering what you are using? I tried googling, but I can't seem to find the Mockito of the clojure world. Searching for a mocking tool in Clojure it looks like there is a lot of small tools being thrown together, but maybe not being used by many? The one exception maybe is https://github.com/marick/Midje? Thanks, Erik. -- - Ola Ellnestam Agical AB Västerlånggatan 79, 2 tr 111 29 Stockholm, SWEDEN Mobile: +46-708-754000 E-mail: ola.ellnes...@agical.se Blog: http://ellnestam.wordpress.com Twitter: ellnestam -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Mocking framework
jay fields has a good blog post on this: http://blog.jayfields.com/2010/09/clojure-mocking.html On Tue, Jun 28, 2011 at 2:52 AM, Ola Ellnestam ola.ellnes...@agical.se wrote: Hi Erik, Take a closer look at Midje, especially https://github.com/marick/Midje/wiki/Metaconstants I'm not an subject matter expert but to me it's close enough to mocking/stubbing. Cheers, Ola Erik Bakstad skrev 2011-06-28 08:56: Hi, I'm currently working on my first real Clojure project, and I find myself wanting a mocking tool. So I was wondering what you are using? I tried googling, but I can't seem to find the Mockito of the clojure world. Searching for a mocking tool in Clojure it looks like there is a lot of small tools being thrown together, but maybe not being used by many? The one exception maybe is https://github.com/marick/Midje? Thanks, Erik. -- - Ola Ellnestam Agical AB Västerlånggatan 79, 2 tr 111 29 Stockholm, SWEDEN Mobile: +46-708-754000 E-mail: ola.ellnes...@agical.se Blog: http://ellnestam.wordpress.com Twitter: ellnestam -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Mocking framework
...and a classic (not clojure specific) http://codebetter.com/gregyoung/2008/02/13/mocks-are-a-code-smell/ (Disclaimer: I don't necessarily share Greg's opinion, but interesting nonetheless) 2011/6/28 gaz jones gareth.e.jo...@gmail.com jay fields has a good blog post on this: http://blog.jayfields.com/2010/09/clojure-mocking.html On Tue, Jun 28, 2011 at 2:52 AM, Ola Ellnestam ola.ellnes...@agical.se wrote: Hi Erik, Take a closer look at Midje, especially https://github.com/marick/Midje/wiki/Metaconstants I'm not an subject matter expert but to me it's close enough to mocking/stubbing. Cheers, Ola Erik Bakstad skrev 2011-06-28 08:56: Hi, I'm currently working on my first real Clojure project, and I find myself wanting a mocking tool. So I was wondering what you are using? I tried googling, but I can't seem to find the Mockito of the clojure world. Searching for a mocking tool in Clojure it looks like there is a lot of small tools being thrown together, but maybe not being used by many? The one exception maybe is https://github.com/marick/Midje? Thanks, Erik. -- - Ola Ellnestam Agical AB Västerlånggatan 79, 2 tr 111 29 Stockholm, SWEDEN Mobile: +46-708-754000 E-mail: ola.ellnes...@agical.se Blog: http://ellnestam.wordpress.com Twitter: ellnestam -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- László Török Skype: laczoka2000 Twitter: @laczoka -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Best Way To Extract Data From Lazy Sequence
Given this test program: (ns test-csv (:gen-class) (:use clojure.contrib.command-line) (:use clojure-csv.core)) (defn process-file Process csv file and prints first item in every row [file-name] (let [data (slurp file-name) rows (parse-csv data)] (dorun (map #(println (first %)) rows (defn -main [ args] (with-command-line args Get csv file name [[file-name .csv file name 1]] (println file-name:, file-name) (if file-name (process-file resultset.csv) (process-file file-name is it reasonable to write a recursive function that takes the lazy sequence -- rows -- (returned from clojure-csv) and column numbers and recurses until the appropriate column number is reached, or is it better to build up a long series of expressions that would pull the columns out? For example, I believe I can pull out the second column by specifying (first (next rows)), but it would look pretty awful to create a long enough expression to get the 6th column in. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Best Way To Extract Data From Lazy Sequence
If you are trying to get the 6th row, you might use the nth function. It allows you to grab an element based on its index. That'd be better than tons of (next (next (next rows))) stuff. user= (doc nth) - clojure.core/nth ([coll index] [coll index not-found]) Returns the value at the index. get returns nil if index out of bounds, nth throws an exception unless not-found is supplied. nth also works for strings, Java arrays, regex Matchers and Lists, and, in O(n) time, for sequences. Alex On Tue, Jun 28, 2011 at 7:42 AM, octopusgrabbus octopusgrab...@gmail.com wrote: Given this test program: (ns test-csv (:gen-class) (:use clojure.contrib.command-line) (:use clojure-csv.core)) (defn process-file Process csv file and prints first item in every row [file-name] (let [data (slurp file-name) rows (parse-csv data)] (dorun (map #(println (first %)) rows (defn -main [ args] (with-command-line args Get csv file name [[file-name .csv file name 1]] (println file-name:, file-name) (if file-name (process-file resultset.csv) (process-file file-name is it reasonable to write a recursive function that takes the lazy sequence -- rows -- (returned from clojure-csv) and column numbers and recurses until the appropriate column number is reached, or is it better to build up a long series of expressions that would pull the columns out? For example, I believe I can pull out the second column by specifying (first (next rows)), but it would look pretty awful to create a long enough expression to get the 6th column in. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Re: Handling java streams..
On Tue, Jun 28, 2011 at 2:19 AM, Meikel Brandmeyer m...@kotka.de wrote: Hi, Am Montag, 27. Juni 2011 23:50:52 UTC+2 schrieb Ken Wesson: a) it isn't found by searching the docs in many of the usual ways; Is that really so hard? http://clojure.github.com/clojure top-right TOC: clojure.java.io If I look for stream handling, wouldn't that sound interesting? Sadly the mind-reading documentation site is not ready, yet. Until then I recommend to read (and experiment with) one or two random functions from the reference every day. In that way you (not you, Ken. you in general the newbie) get an overview and get familiar with the docs. Well, of course *I* know this. But I guess a lot of people mostly just keep a browser tab parked at http://clojure.github.com/clojure/clojure.core-api.html and occasionally go to it and hit ctrl+F or F3 or whatever the usual search hotkey is in Windoze apps, with results similar to using find-doc except without cluttering their REPL history or backscroll or getting scrolled out of view by using the REPL to try things. How else do you propose to explain the observation that if it isn't in clojure.core, it tends to be underused? :) -- Protege: What is this seething mass of parentheses?! Master: Your father's Lisp REPL. This is the language of a true hacker. Not as clumsy or random as C++; a language for a more civilized age. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Re: Handling java streams..
On Tue, Jun 28, 2011 at 10:40 AM, Ken Wesson kwess...@gmail.com wrote: How else do you propose to explain the observation that if it isn't in clojure.core, it tends to be underused? :) Well, that's your observation so it's rather circular logic :) -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Railo Technologies, Inc. -- http://www.getrailo.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Best Way To Extract Data From Lazy Sequence
Thanks. That works perfectly. (ns test-csv (:gen-class) (:use clojure.contrib.command-line) (:use clojure-csv.core)) (defn x1 [val1 val2] (println val1 val2)) (defn process-file Process csv file and prints a column in every row [file-name] (let [data (slurp file-name) rows (parse-csv data)] (dorun (map #(println ( nth % 11 nil)) rows (defn -main [ args] (with-command-line args Get csv file name [[file-name .csv file name resultset.csv]] [[file-name .csv file name 1]] (println file-name:, file-name) (process-file file-name))) On Jun 28, 9:01 am, Alex Robbins alexander.j.robb...@gmail.com wrote: If you are trying to get the 6th row, you might use the nth function. It allows you to grab an element based on its index. That'd be better than tons of (next (next (next rows))) stuff. user= (doc nth) - clojure.core/nth ([coll index] [coll index not-found]) Returns the value at the index. get returns nil if index out of bounds, nth throws an exception unless not-found is supplied. nth also works for strings, Java arrays, regex Matchers and Lists, and, in O(n) time, for sequences. Alex On Tue, Jun 28, 2011 at 7:42 AM, octopusgrabbus octopusgrab...@gmail.com wrote: Given this test program: (ns test-csv (:gen-class) (:use clojure.contrib.command-line) (:use clojure-csv.core)) (defn process-file Process csv file and prints first item in every row [file-name] (let [data (slurp file-name) rows (parse-csv data)] (dorun (map #(println (first %)) rows (defn -main [ args] (with-command-line args Get csv file name [[file-name .csv file name 1]] (println file-name:, file-name) (if file-name (process-file resultset.csv) (process-file file-name is it reasonable to write a recursive function that takes the lazy sequence -- rows -- (returned from clojure-csv) and column numbers and recurses until the appropriate column number is reached, or is it better to build up a long series of expressions that would pull the columns out? For example, I believe I can pull out the second column by specifying (first (next rows)), but it would look pretty awful to create a long enough expression to get the 6th column in. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
How To Supply Multiple Values To Function In Map
Given this sample: (ns test-csv (:gen-class) (:use clojure.contrib.command-line) (:use clojure-csv.core)) (defn x1 [val1 val2] (println val1 val2)) (defn process-file Process csv file and prints a column in every row [file-name] (let [data (slurp file-name) rows (parse-csv data)] (dorun (map #(println ( nth % 11 nil)) rows (defn -main [ args] (with-command-line args Get csv file name [[file-name .csv file name resultset.csv]] [[file-name .csv file name 1]] (println file-name:, file-name) (process-file file-name))) I would like to print out two or more values, or creating a vector of those values would be helpful. I have been experimenting, but either get errors or nothing printed out. I am just not sure how to approach this. Thanks. cmn -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: How To Supply Multiple Values To Function In Map
map takes a function and a collection. So, that function can be: 1. named: - define the function on it own, using the defn macro - pass it as first argument to map (def coll [[1 2] [3 4] [4 5]]) (defn foo [x y] (println x y)) (map foo coll) 2. anonymous: - use shorthand notation #(...) -- for one argument function, % represents the argument -- for multiple args, use %1, %2, %3, etc., which represent arg in specified position - use the fn special form (fn [x y] ...) - specify these inline in map call (def coll [[1 2] [3 4] [4 5]]) (map #(println %1 %2) coll) (map (fn [x y] (println x y)) coll) On Tue, Jun 28, 2011 at 2:58 PM, octopusgrabbus octopusgrab...@gmail.comwrote: Given this sample: (ns test-csv (:gen-class) (:use clojure.contrib.command-line) (:use clojure-csv.core)) (defn x1 [val1 val2] (println val1 val2)) (defn process-file Process csv file and prints a column in every row [file-name] (let [data (slurp file-name) rows (parse-csv data)] (dorun (map #(println ( nth % 11 nil)) rows (defn -main [ args] (with-command-line args Get csv file name [[file-name .csv file name resultset.csv]] [[file-name .csv file name 1]] (println file-name:, file-name) (process-file file-name))) I would like to print out two or more values, or creating a vector of those values would be helpful. I have been experimenting, but either get errors or nothing printed out. I am just not sure how to approach this. Thanks. cmn -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: How To Supply Multiple Values To Function In Map
Thanks. I've followed most of what you've written except how the symbol col fits into this, unless you're using it as map values. On Jun 28, 3:11 pm, Mark Rathwell mark.rathw...@gmail.com wrote: map takes a function and a collection. So, that function can be: 1. named: - define the function on it own, using the defn macro - pass it as first argument to map (def coll [[1 2] [3 4] [4 5]]) (defn foo [x y] (println x y)) (map foo coll) 2. anonymous: - use shorthand notation #(...) -- for one argument function, % represents the argument -- for multiple args, use %1, %2, %3, etc., which represent arg in specified position - use the fn special form (fn [x y] ...) - specify these inline in map call (def coll [[1 2] [3 4] [4 5]]) (map #(println %1 %2) coll) (map (fn [x y] (println x y)) coll) On Tue, Jun 28, 2011 at 2:58 PM, octopusgrabbus octopusgrab...@gmail.comwrote: Given this sample: (ns test-csv (:gen-class) (:use clojure.contrib.command-line) (:use clojure-csv.core)) (defn x1 [val1 val2] (println val1 val2)) (defn process-file Process csv file and prints a column in every row [file-name] (let [data (slurp file-name) rows (parse-csv data)] (dorun (map #(println ( nth % 11 nil)) rows (defn -main [ args] (with-command-line args Get csv file name [[file-name .csv file name resultset.csv]] [[file-name .csv file name 1]] (println file-name:, file-name) (process-file file-name))) I would like to print out two or more values, or creating a vector of those values would be helpful. I have been experimenting, but either get errors or nothing printed out. I am just not sure how to approach this. Thanks. cmn -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: How To Supply Multiple Values To Function In Map
coll is the vector defined at the top of each code listing in the examples given, and is used as the second argument to map in all examples. Sent from my iPhone On Jun 28, 2011, at 3:20 PM, octopusgrabbus octopusgrab...@gmail.com wrote: Thanks. I've followed most of what you've written except how the symbol col fits into this, unless you're using it as map values. On Jun 28, 3:11 pm, Mark Rathwell mark.rathw...@gmail.com wrote: map takes a function and a collection. So, that function can be: 1. named: - define the function on it own, using the defn macro - pass it as first argument to map (def coll [[1 2] [3 4] [4 5]]) (defn foo [x y] (println x y)) (map foo coll) 2. anonymous: - use shorthand notation #(...) -- for one argument function, % represents the argument -- for multiple args, use %1, %2, %3, etc., which represent arg in specified position - use the fn special form (fn [x y] ...) - specify these inline in map call (def coll [[1 2] [3 4] [4 5]]) (map #(println %1 %2) coll) (map (fn [x y] (println x y)) coll) On Tue, Jun 28, 2011 at 2:58 PM, octopusgrabbus octopusgrab...@gmail.comwrote: Given this sample: (ns test-csv (:gen-class) (:use clojure.contrib.command-line) (:use clojure-csv.core)) (defn x1 [val1 val2] (println val1 val2)) (defn process-file Process csv file and prints a column in every row [file-name] (let [data (slurp file-name) rows (parse-csv data)] (dorun (map #(println ( nth % 11 nil)) rows (defn -main [ args] (with-command-line args Get csv file name [[file-name .csv file name resultset.csv]] [[file-name .csv file name 1]] (println file-name:, file-name) (process-file file-name))) I would like to print out two or more values, or creating a vector of those values would be helpful. I have been experimenting, but either get errors or nothing printed out. I am just not sure how to approach this. Thanks. cmn -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: ordered map in Clojure?
Alan Malloy a...@malloys.org writes: Hi Alan, ArrayMap isn't very performant for large collections. You might like https://github.com/flatland/ordered in my clojure app, I totally rely on ordered sets. Currently, I use https://github.com/ninjudd/ordered-set for which I've implemented transient support which is already incorporated and released. Looking at your code, it basically looks identical wrt features, except that your implementation is comletely in clojure (and includes maps) while ninjudd's implementation is mainly java. If you know ninjudd's lib, can you give advice in what use-cases you'd prefer your own lib? Basically, in my scenario I only conjoin using `into' but never disjoin, and performance for that is very important. That's why I've implemented the transient support. But as it turned out, that didn't improve performance significantly, cause the calculation of set members is far more expensive than aggregating them... Well, in any case, I think I'll simply try it out at the weekend. Hopefully, I'm able to get some totally non-empirical benchmark results from my test suite that I can poste here. Bye, Tassilo -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Any ways to prevent protocol functions from being hardcoded in?
I'm looking to do something like this: (defprotocol Addable (add-fields [this])) (defrecord MyRecord [a b] Addable (add-fields [this] (+ a b))) ;;; Magic happens here (defn indirect-adder [a b] (add-fields (MyRecord. a b))) (with-definition-of-add-fields-changed-to (fn [_] hi mom) (indirect-adder 1 2) = hi mom ; rather than 3 I expect there are no tricks like :dynamic true http://blog.n01se.net/?p=134 that work, but I thought I'd check. - Brian Marick, Artisanal Labrador Contract programming in Ruby and Clojure Occasional consulting on Agile www.exampler.com, www.twitter.com/marick -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
dj updates
It's been a year and I'm still using dj and still developing for it. git://github.com/bmillare/dj.git Some recent additions: * You can depend on clojure contrib github projects via: :src-dependencies [clojure/core.logic] All projects with clojure/ prefixed to the name are considered to be a contrib dependency. * You can update projects, dj, and clojure, from within dj (a little sugar is nice when deploying) * You can run scripts in the context of a project with: dj run filename [project-name] Which is good for people that like swank or servers Best, Brent -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Any ways to prevent protocol functions from being hardcoded in?
The protocol method `add-fields` becomes an ordinary Clojure Var. You can temporarily change its root binding using `with-redefs` in 1.3. -S -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Mocking framework
On Jun 28, 2011, at 7:23 AM, László Török wrote: ...and a classic (not clojure specific) http://codebetter.com/gregyoung/2008/02/13/mocks-are-a-code-smell/ One thing I'm trying to emphasize with Midje is that mocking in the context of a functional language is (can be) about the logical connections among functions in a system. That's why Midje avoids test terminology in favor of something that looks more logic/Prolog-ish. As a simple example: (fact ratings of movies with favorite actors are bumped a bit higher (rating ...movie...) = (roughly (* 1.2 4.0)) (provided (critic-rating ...movie...) = 4.0 (intersection (actors ...movie...) (favorite-actors)) =not= empty?))) Mike Feathers and I will be having a presentation about tests as a means of abstraction at Agile2011 http://program2011.agilealliance.org/event/873f7801c8b4f23fc1f0cfe0a45de2f5 and I've submitted a derivative session to Clojure Conj. [Besides sometimes allowing the removal of even more incidental complexity than straight clojure code does, another means of abstraction is deferring decisions about data structures. In the above, we don't have to know anything about what a movie is except that `critic-rating` and `actors` work with it, which is saying something like what `defprotocol` says.] - Brian Marick, Artisanal Labrador Contract programming in Ruby and Clojure Occasional consulting on Agile www.exampler.com, www.twitter.com/marick -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Any ways to prevent protocol functions from being hardcoded in?
On Jun 28, 2011, at 4:17 PM, Stuart Sierra wrote: The protocol method `add-fields` becomes an ordinary Clojure Var. You can temporarily change its root binding using `with-redefs` in 1.3. `with-redefs` has no effect on an already-compiled function that uses a defrecord-defined function. I would need something that says O compiler, being able to redef functions is actually more important to me right now than efficiency, so please emit code that notices redefs in, for example: (defn indirect-adder [a b] (add-fields (MyRecord. a b))) I have a kinda-kludgy workaround that does essentially that. It suffices. - Brian Marick, Artisanal Labrador Contract programming in Ruby and Clojure Occasional consulting on Agile www.exampler.com, www.twitter.com/marick -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
lexer written in clojure?
I've done a bit of reading on fnparse and found it be a cleanly implemented parser, suitable to my purposes. That said, it appears to still be dependent upon an external lexer for its feed, similar to most parsers. Aside from those lexers implemented directly in Java such as JLex is anyone aware of a lexer implemented entirely in the Clojure language. Ideally, a grammar based lexer generator would be of most interest but I would settle for a lexer DSL written in Clojure. Ideas welcome. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Translating Java code with nested for loops
Hi
I have been learning clojure for some time but am a bit stumped when
translating code with nested for loops.
Can someone help me to translate the following java code to clojure
elegantly:
The inputs are two arrays of type double of the same length -
dailyValues and totalValues. The output is the array contrib of the same
length.
int n = dailyValues.length;
for (int i = 0; i n; i++)
{
sum = 1.0;
for (int j = i + 1; j n; j++)
{
sum *= (1.0 + (totalValues[j] / 100.0));
}
contrib[i] = sum * dailyValues[i];
}
Many thanks for your help.
-- Shoeb
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ClassCastException on 'clojure.data.json/print-json'
I'm trying to do a simple print-json, and am getting a ClassCastException in
the data.json library. I'm using [org.clojure/clojure 1.3.0-beta1] and
[org.clojure/data.json 0.1.0]. So…
* lein repl *
*…*
*user = (require 'clojure.data.json)*
*nil *
*
*
*user = (clojure.data.json/print-json tim)*
*ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-string (json.clj:229)*
*
*
*user= (clojure.data.json/print-json [1 2 3]) *
*ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-array (json.clj:254)*
*
*
*user = (clojure.data.json/print-json { :a { :aa b } } ) *
*ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-object (json.clj:238)*
Seems fairly straightforward (I've also tried on lists, nested hashes, etc).
If I look at the source for
json:229https://github.com/clojure/data.json/blob/master/src/main/clojure/clojure/data/json.clj
,
the 'out' variable looks to be a PrintWriter (and my local source version is
the same). And a stacktrace gives exactly that location
*user= (. *e printStackTrace)*
*java.lang.ClassCastException: java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter*
*at clojure.data.json$write_json_string.invoke(json.clj:229)*
*at
clojure.data.json$eval108$fn__109$G__99__118.invoke(json.clj:201)*
*at clojure.data.json$print_json.doInvoke(json.clj:331)*
*at clojure.lang.RestFn.invoke(RestFn.java:410)*
*at user$eval212.invoke(NO_SOURCE_FILE:24)*
*at clojure.lang.Compiler.eval(Compiler.java:6406)*
*at clojure.lang.Compiler.eval(Compiler.java:6372)*
*at clojure.core$eval.invoke(core.clj:2745)*
*at clojure.main$repl$read_eval_print__6016.invoke(main.clj:244)*
*at clojure.main$repl$fn__6021.invoke(main.clj:265)*
*at clojure.main$repl.doInvoke(main.clj:265)*
*at clojure.lang.RestFn.invoke(RestFn.java:512)*
*at user$eval7$acc__1060__auto8$fn__10.invoke(NO_SOURCE_FILE:1)*
*at clojure.lang.AFn.run(AFn.java:24)*
*at java.lang.Thread.run(Thread.java:636)*
*nil*
*user=*
Is there a problem in the data.json lib?
Tim
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Idiomatic way to reference a bundled data file from Clojure source?
Hi, I'd like to bundle a collection of (JSON) datafiles with a Clojure project source tree so that Clojure functions can reliably find and open those datafiles. What's the idiomatic way of going about this? In the past with other languages I've used tricks like Ruby's .dirname(__FILE__)/... construct but this kind of approach doesn't seem a good fit for Clojure or for the JVM facilities it provides. Can anyone point to a Clojure project that does this well? Thanks, Stu -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: ClassCastException on 'clojure.data.json/print-json'
Ok, so I fixed the problem by changing A) to B)
A)
(*defn *print-json
...
(*write-json* x **out** escape-unicode)))
to
B)
(*defn *print-json
...
(*write-json* *(PrintWriter. *out*)* escape-unicode)))
The only thing now, is that the 'nil' return value suffixes itself. I can
find out where that is. But I think this this could be fixed easily enough.
If you like, I can do this locally and, I guessing, submit a github pull
request.
user = (clojure.data.json/print-json tim)
timnil
user= (clojure.data.json/print-json [1 2 3])
[1,2,3]nil
user = (clojure.data.json/print-json { :a { :aa b } } )
{a:{aa:b}}nil
Tim
On Tue, Jun 28, 2011 at 8:59 PM, Timothy Washington twash...@gmail.comwrote:
I'm trying to do a simple print-json, and am getting a ClassCastException
in the data.json library. I'm using [org.clojure/clojure 1.3.0-beta1] and
[org.clojure/data.json 0.1.0]. So…
* lein repl *
*…*
*user = (require 'clojure.data.json)*
*nil *
*
*
*user = (clojure.data.json/print-json tim)*
*ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-string (json.clj:229)*
*
*
*user= (clojure.data.json/print-json [1 2 3]) *
*ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-array (json.clj:254)*
*
*
*user = (clojure.data.json/print-json { :a { :aa b } } ) *
*ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-object (json.clj:238)*
Seems fairly straightforward (I've also tried on lists, nested hashes,
etc). If I look at the source for
json:229https://github.com/clojure/data.json/blob/master/src/main/clojure/clojure/data/json.clj
,
the 'out' variable looks to be a PrintWriter (and my local source version is
the same). And a stacktrace gives exactly that location
*user= (. *e printStackTrace)*
*java.lang.ClassCastException: java.io.OutputStreamWriter cannot be cast
to java.io.PrintWriter*
*at clojure.data.json$write_json_string.invoke(json.clj:229)*
*at
clojure.data.json$eval108$fn__109$G__99__118.invoke(json.clj:201)*
*at clojure.data.json$print_json.doInvoke(json.clj:331)*
*at clojure.lang.RestFn.invoke(RestFn.java:410)*
*at user$eval212.invoke(NO_SOURCE_FILE:24)*
*at clojure.lang.Compiler.eval(Compiler.java:6406)*
*at clojure.lang.Compiler.eval(Compiler.java:6372)*
*at clojure.core$eval.invoke(core.clj:2745)*
*at clojure.main$repl$read_eval_print__6016.invoke(main.clj:244)*
*at clojure.main$repl$fn__6021.invoke(main.clj:265)*
*at clojure.main$repl.doInvoke(main.clj:265)*
*at clojure.lang.RestFn.invoke(RestFn.java:512)*
*at
user$eval7$acc__1060__auto8$fn__10.invoke(NO_SOURCE_FILE:1)*
*at clojure.lang.AFn.run(AFn.java:24)*
*at java.lang.Thread.run(Thread.java:636)*
*nil*
*user=*
Is there a problem in the data.json lib?
Tim
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Re: Idiomatic way to reference a bundled data file from Clojure source?
Hey, I don't have a good example, but the right way to do is with resources which are basically just files that live on the classpath: * Put the files in a folder on your classpath. If your using leiningen, the resources/ directory does this by default. * Get a URL to the file with clojure.java.io/resource. If your file is root/resources/my-project/my-resource.txt, you'd use (resource my-project/my-resource.txt). * Read the contents of the file by passing the resource URL to clojure.java.io/reader or one of its friends. When you jar up your app the resource files will be included in the jar and just work. Hope this helps. Dave On Tue, Jun 28, 2011 at 9:12 PM, stu stuart.hungerf...@gmail.com wrote: Hi, I'd like to bundle a collection of (JSON) datafiles with a Clojure project source tree so that Clojure functions can reliably find and open those datafiles. What's the idiomatic way of going about this? In the past with other languages I've used tricks like Ruby's .dirname(__FILE__)/... construct but this kind of approach doesn't seem a good fit for Clojure or for the JVM facilities it provides. Can anyone point to a Clojure project that does this well? Thanks, Stu -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Idiomatic way to reference a bundled data file from Clojure source?
I'd like to bundle a collection of (JSON) datafiles with a Clojure project source tree so that Clojure functions can reliably find and open those datafiles. What's the idiomatic way of going about this? One idiomatic way to do this in Clojure is: - store the files within a directory named resources at the top level of your project folder, - arrange for that folder to be in your classpath at runtime, - obtain a reference to the files at runtime using .getResource with a relative path. If you use lieningen, the resources folder will be in your class path automatically and the files/directories it contains will be copied to the top level of your jar file if you make one. Here's an example: (defn resource [path] (when path (- (Thread/currentThread) .getContextClassLoader (.getResource path (require '[clojure.java.io :as io]) (slurp (io/file (resource js/boo.js))) I did this in a leiningen project called scratch. It returned the contents of the file scratch/resources/js/boo.js because scratch/resources was on the classpath. See also http://alexott.net/en/clojure/ClojureLein.html . --Steve -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: ClassCastException on 'clojure.data.json/print-json'
are you trying to turn something into a json string? if so, the
json-str function is probably what you are looking for:
user (json/json-str {:a b})
{\a\:\b\}
by the way, the nil in your previous email is not being suffixed to
the string, its simply the return of the function getting written to
stdout by the repl immediately after the function has printed there
also. simply pressing enter at the repl will cause 'nil' to be printed
too...
On Tue, Jun 28, 2011 at 8:46 PM, Timothy Washington twash...@gmail.com wrote:
Ok, so I fixed the problem by changing A) to B)
A)
(defn print-json
...
(write-json x *out* escape-unicode)))
to
B)
(defn print-json
...
(write-json (PrintWriter. *out*) escape-unicode)))
The only thing now, is that the 'nil' return value suffixes itself. I can
find out where that is. But I think this this could be fixed easily enough.
If you like, I can do this locally and, I guessing, submit a github pull
request.
user = (clojure.data.json/print-json tim)
timnil
user= (clojure.data.json/print-json [1 2 3])
[1,2,3]nil
user = (clojure.data.json/print-json { :a { :aa b } } )
{a:{aa:b}}nil
Tim
On Tue, Jun 28, 2011 at 8:59 PM, Timothy Washington twash...@gmail.com
wrote:
I'm trying to do a simple print-json, and am getting a ClassCastException
in the data.json library. I'm using [org.clojure/clojure 1.3.0-beta1] and
[org.clojure/data.json 0.1.0]. So…
lein repl
…
user = (require 'clojure.data.json)
nil
user = (clojure.data.json/print-json tim)
ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-string (json.clj:229)
user= (clojure.data.json/print-json [1 2 3])
ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-array (json.clj:254)
user = (clojure.data.json/print-json { :a { :aa b } } )
ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-object (json.clj:238)
Seems fairly straightforward (I've also tried on lists, nested hashes,
etc). If I look at the source for json:229 , the 'out' variable looks to be
a PrintWriter (and my local source version is the same). And a stacktrace
gives exactly that location
user= (. *e printStackTrace)
java.lang.ClassCastException: java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter
at clojure.data.json$write_json_string.invoke(json.clj:229)
at
clojure.data.json$eval108$fn__109$G__99__118.invoke(json.clj:201)
at clojure.data.json$print_json.doInvoke(json.clj:331)
at clojure.lang.RestFn.invoke(RestFn.java:410)
at user$eval212.invoke(NO_SOURCE_FILE:24)
at clojure.lang.Compiler.eval(Compiler.java:6406)
at clojure.lang.Compiler.eval(Compiler.java:6372)
at clojure.core$eval.invoke(core.clj:2745)
at clojure.main$repl$read_eval_print__6016.invoke(main.clj:244)
at clojure.main$repl$fn__6021.invoke(main.clj:265)
at clojure.main$repl.doInvoke(main.clj:265)
at clojure.lang.RestFn.invoke(RestFn.java:512)
at user$eval7$acc__1060__auto8$fn__10.invoke(NO_SOURCE_FILE:1)
at clojure.lang.AFn.run(AFn.java:24)
at java.lang.Thread.run(Thread.java:636)
nil
user=
Is there a problem in the data.json lib?
Tim
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Guide to Programming in Clojure for Beginners
I'm fairly new to Programming, Clojure and Blogging, but I did manage to write a few posts about Clojure in my spare time. http://blackstag.com/blog.posting?id=5 I have now have a newly found appreciation for how much effort this kind of stuff can be :) Feedback is always welcome. Regards, Tim -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Translating Java code with nested for loops
On Jun 28, 2011, at 8:20 PM, Bhinderwala, Shoeb wrote:
The inputs are two arrays of type double of the same length – dailyValues and
totalValues. The output is the array contrib of the same length.
int n = dailyValues.length;
for (int i = 0; i n; i++)
{
sum = 1.0;
for (int j = i + 1; j n; j++)
{
sum *= (1.0 + (totalValues[j] / 100.0));
}
contrib[i] = sum * dailyValues[i];
}
1. Are you sure that this does what you want it to?
2. What does it do?
There are two obvious red flags with the code:
-You have a variable called 'sum' which is really a product.
-You never use index 0 of totalValues
Have all good days,
David Sletten
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Re: ClassCastException on 'clojure.data.json/print-json'
Hey Gareth,
Yes, in my library, I'm returning a string. So indeed I will be using
json-str. But on the command-line, I sometimes want to print or pretty-print
something out. I forked data.json and submitted a pull request with the
'(PrintWriter. *out*)' fix put in. Hopefully it solves the problem.
And yes, the repl does spit out the result of the last command. I probably
misstated that as a problem (wanted something prettier at the moment). It's
not, as json.clj internally uses .print.
Thanks
Tim Washington
twash...@gmail.com
416.843.9060
On Tue, Jun 28, 2011 at 11:03 PM, gaz jones gareth.e.jo...@gmail.comwrote:
are you trying to turn something into a json string? if so, the
json-str function is probably what you are looking for:
user (json/json-str {:a b})
{\a\:\b\}
by the way, the nil in your previous email is not being suffixed to
the string, its simply the return of the function getting written to
stdout by the repl immediately after the function has printed there
also. simply pressing enter at the repl will cause 'nil' to be printed
too...
On Tue, Jun 28, 2011 at 8:46 PM, Timothy Washington twash...@gmail.com
wrote:
Ok, so I fixed the problem by changing A) to B)
A)
(defn print-json
...
(write-json x *out* escape-unicode)))
to
B)
(defn print-json
...
(write-json (PrintWriter. *out*) escape-unicode)))
The only thing now, is that the 'nil' return value suffixes itself. I can
find out where that is. But I think this this could be fixed easily
enough.
If you like, I can do this locally and, I guessing, submit a github pull
request.
user = (clojure.data.json/print-json tim)
timnil
user= (clojure.data.json/print-json [1 2 3])
[1,2,3]nil
user = (clojure.data.json/print-json { :a { :aa b } } )
{a:{aa:b}}nil
Tim
On Tue, Jun 28, 2011 at 8:59 PM, Timothy Washington twash...@gmail.com
wrote:
I'm trying to do a simple print-json, and am getting a
ClassCastException
in the data.json library. I'm using [org.clojure/clojure 1.3.0-beta1]
and
[org.clojure/data.json 0.1.0]. So…
lein repl
…
user = (require 'clojure.data.json)
nil
user = (clojure.data.json/print-json tim)
ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-string (json.clj:229)
user= (clojure.data.json/print-json [1 2 3])
ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-array (json.clj:254)
user = (clojure.data.json/print-json { :a { :aa b } } )
ClassCastException java.io.OutputStreamWriter cannot be cast to
java.io.PrintWriter clojure.data.json/write-json-object (json.clj:238)
Seems fairly straightforward (I've also tried on lists, nested hashes,
etc). If I look at the source for json:229 , the 'out' variable looks to
be
a PrintWriter (and my local source version is the same). And a
stacktrace
gives exactly that location
user= (. *e printStackTrace)
java.lang.ClassCastException: java.io.OutputStreamWriter cannot be cast
to
java.io.PrintWriter
at clojure.data.json$write_json_string.invoke(json.clj:229)
at
clojure.data.json$eval108$fn__109$G__99__118.invoke(json.clj:201)
at clojure.data.json$print_json.doInvoke(json.clj:331)
at clojure.lang.RestFn.invoke(RestFn.java:410)
at user$eval212.invoke(NO_SOURCE_FILE:24)
at clojure.lang.Compiler.eval(Compiler.java:6406)
at clojure.lang.Compiler.eval(Compiler.java:6372)
at clojure.core$eval.invoke(core.clj:2745)
at clojure.main$repl$read_eval_print__6016.invoke(main.clj:244)
at clojure.main$repl$fn__6021.invoke(main.clj:265)
at clojure.main$repl.doInvoke(main.clj:265)
at clojure.lang.RestFn.invoke(RestFn.java:512)
at
user$eval7$acc__1060__auto8$fn__10.invoke(NO_SOURCE_FILE:1)
at clojure.lang.AFn.run(AFn.java:24)
at java.lang.Thread.run(Thread.java:636)
nil
user=
Is there a problem in the data.json lib?
Tim
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Re: Idiomatic way to reference a bundled data file from Clojure source?
On Jun 29, 12:17 pm, Stephen C. Gilardi squee...@mac.com wrote: I'd like to bundle a collection of (JSON) datafiles with a Clojure project source tree so that Clojure functions can reliably find and open those datafiles. What's the idiomatic way of going about this? Many thanks to Dave and Stephen for your answers--just what I needed. Stu -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Translating Java code with nested for loops
Here's one way.
(defn tails [coll]
(take-while seq (iterate rest coll)))
(defn calc [total-values daily-values]
(map * daily-values (for [tail (tails total-values)]
(reduce #(* %1 (inc (/ %2 100.0)))
1.0
(rest tail)
In translating it, I first tried to visualize the algorithm[1]. Then I
transcribed that visualization into the usual suspects: map/for,
reduce, filter. Having a solid grasp of each of those -- not to
mention the rest of clojure.core -- is very helpful.
[1] http://i.imgur.com/XDZhm.png (crude drawing of the first step)
Hope that helps,
Justin
On Jun 28, 8:20 pm, Bhinderwala, Shoeb
sabhinderw...@wellington.com wrote:
Hi
I have been learning clojure for some time but am a bit stumped when
translating code with nested for loops.
Can someone help me to translate the following java code to clojure
elegantly:
The inputs are two arrays of type double of the same length -
dailyValues and totalValues. The output is the array contrib of the same
length.
int n = dailyValues.length;
for (int i = 0; i n; i++)
{
sum = 1.0;
for (int j = i + 1; j n; j++)
{
sum *= (1.0 + (totalValues[j] / 100.0));
}
contrib[i] = sum * dailyValues[i];
}
Many thanks for your help.
-- Shoeb
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Re: ordered map in Clojure?
Well, I wrote the clojure version after boasting to ninjudd that deftype would let you do it without writing any java at all. I did some simple-minded benchmarking, and while I don't recall the exact numbers his java version is ~10-50% faster. If you look through the git logs, somewhere I have a version that is only 5% slower than his, but when I added efficient disjoin support that slowed down the conj case a bit; we decided that the purity was worth the performance cost. If you want to resurrect that version, let me know and I'll hunt it down. I also have a version with even more-efficient disjoin but it slowed conjing down to log2(n) instead of log32(n), and that performance hit, while theoretically nil, was very noticeable in practice. If I were using this for some performance-critical task and never disjoined, I'd use ninjudd's version. Otherwise I'd use mine, just because it's easier to build and tweak since it's in clojure. On Jun 28, 12:54 pm, Tassilo Horn tass...@member.fsf.org wrote: Alan Malloy a...@malloys.org writes: Hi Alan, ArrayMap isn't very performant for large collections. You might like https://github.com/flatland/ordered in my clojure app, I totally rely on ordered sets. Currently, I use https://github.com/ninjudd/ordered-set for which I've implemented transient support which is already incorporated and released. Looking at your code, it basically looks identical wrt features, except that your implementation is comletely in clojure (and includes maps) while ninjudd's implementation is mainly java. If you know ninjudd's lib, can you give advice in what use-cases you'd prefer your own lib? Basically, in my scenario I only conjoin using `into' but never disjoin, and performance for that is very important. That's why I've implemented the transient support. But as it turned out, that didn't improve performance significantly, cause the calculation of set members is far more expensive than aggregating them... Well, in any case, I think I'll simply try it out at the weekend. Hopefully, I'm able to get some totally non-empirical benchmark results from my test suite that I can poste here. Bye, Tassilo -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Hygenic approach for using Java2D from Clojure?
Hi, I'd like to use Java2D objects in a Clojure application. I understand that these mutable objects will be operating in a Clojure environment where immutability is the order of the day, and this is likely to cause problems. Can someone point me to some good examples of, or techniques for safely using mutable Java objects in Clojure--especially with Clojure parallel programming constructs in mind. Thanks in advance, Stu -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Translating Java code with nested for loops
On Jun 28, 2011, at 11:37 PM, David Sletten wrote:
On Jun 28, 2011, at 8:20 PM, Bhinderwala, Shoeb wrote:
The inputs are two arrays of type double of the same length – dailyValues
and totalValues. The output is the array contrib of the same length.
int n = dailyValues.length;
for (int i = 0; i n; i++)
{
sum = 1.0;
for (int j = i + 1; j n; j++)
{
sum *= (1.0 + (totalValues[j] / 100.0));
}
contrib[i] = sum * dailyValues[i];
}
1. Are you sure that this does what you want it to?
2. What does it do?
There are two obvious red flags with the code:
-You have a variable called 'sum' which is really a product.
-You never use index 0 of totalValues
Assuming that your code is correct, the following reproduces your results:
(defn compute-contrib [daily-values total-values]
(loop [contrib []
daily-values daily-values
total-values total-values]
(if (empty? daily-values)
contrib
(recur (conj contrib (* (first daily-values) (reduce (fn [sum
total-value] (* sum (+ (/ total-value 100.0) 1.0)))
1.0
(rest
total-values
(rest daily-values)
(rest total-values )
In the outer loop you are working with each element of dailyValues and
consecutively smaller subsequences of totalValues. In the inner loop you repeat
a calculation using each of the remaining elements of totalValues starting with
a seed value of 1.0.
The Clojure implementation uses 'loop' to traverse each of the input sequences.
On each iteration we use 'reduce' to do the work of the inner loop (notice that
'reduce' is working with (rest total-values) rather than simply total-values
itself, so we discard the first element each time just as your inner loop
does), multiply that by the current element of interest in daily-values and
then accumulate the result by conjoining it with our result 'contrib'.
The mental shift that you need to make involves forgetting about the index
variables i and j and thinking instead about what the loops are accomplishing.
If an inner loop is collapsing a sequence to a single result as above, then
'reduce' is what you want to use. Other inner loops might require 'map' or
'filter' depending on the computation.
Have all good days,
David Sletten
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