There is really no perfect numerical type:
- primitive doubles are best if you care about performance and reasonably
good precision (but no complex numbers!)
- boxed Doubles are needed in some circumtances, e g. storage in
collections, passing to dynamic code
- something like
user= #java.lang.String[hello world]
hello world
user= #java.lang.String[(byte-array) utf8]
IllegalArgumentException No matching ctor found for class java.lang.String
clojure.lang.Reflector.invokeConstructor (Reflector.java:183)
It seems that the CtorReader
Sorry,the error example must be:
user= #java.lang.String[(byte-array 10) utf8]
IllegalArgumentException No matching ctor found for class java.lang.String
clojure.lang.Reflector.invokeConstructor (Reflector.java:183)
2014-08-16 19:59 GMT+08:00 dennis zhuang killme2...@gmail.com:
user=
It's by design, see the section on ctor literals http://clojure.org/reader#toc1
The elements in the vector part are passed unevaluated to the relevant
constructor.
Nicola
dennis zhuang writes:
user= #java.lang.String[hello world]
hello world
user= #java.lang.String[(byte-array) utf8]
Got it.
Thanks for your quick reply.
2014-08-16 20:14 GMT+08:00 Nicola Mometto brobro...@gmail.com:
It's by design, see the section on ctor literals
http://clojure.org/reader#toc1
The elements in the vector part are passed unevaluated to the relevant
constructor.
Nicola
dennis zhuang
Can someone explain why this is not altering the *data-readers* dynamic
var? Does this work for anyone else? Using 1.6.0
(assert (= {} *data-readers*))
;; nil
(alter-var-root (var *data-readers*) (fn [_] {:test 2}))
;; {:test 2}
(assert (= {:test 2} *data-readers*))
;; AssertionError
(assert
I agree that Clojure could really use an imaginary number type.
The best place to start with this might be `clojure.math.numeric-tower` because
it already provides a
`MathFunctions` protocol that defines a square root operation.
Cheers Jan
On 15 Aug 2014, at 19:54, Maik Schünemann
Because in the repl you're using a thread-local value of *data-readers*,
not the var root, this is because the repl is executed under (binding
[*data-readers ..] ..)
If you try to set! *data-readers* instead, you'll see what you expect.
Consider:
user= (def ^:dynamic x nil)
#'user/x
user= x
nil
Ah yes, I see that
here:
https://github.com/clojure/clojure/blob/clojure-1.6.0/src/clj/clojure/main.clj#L64-L86
Thanks for the quick response!
On Saturday, August 16, 2014 1:36:11 PM UTC+1, Nicola Mometto wrote:
Because in the repl you're using a thread-local value of *data-readers*,
not
On 15 August 2014 19:23, Sean Corfield s...@corfield.org wrote:
Could you elaborate on this Colin?
Sure. IntelliJ uses an IoC container, and you declare your implementations
of their extensions in an XML file, like this
I agree with mikera on this, the standard numeric abstraction have to be
able to fulfill all performance needs.
This definitly excludes multimethods (algo.generic) and
protocols/interface-calls (numeric-tower).
(Imagine multiplying two 5000x5000 matrices and having to go through a
protocol for
Hello everyone.
This is a lein plugin that helps you add dependencies to projects pretty
quickly. The git repo is here: https://github.com/johnwalker/lein-plz
Basically, you write something like this:
lein new foo
cd foo
lein plz add cljs async match jdbc
and get this:
(defproject foo
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