I am parsing a file and to compare the current line
with the previous line of the file. I am using line-seq
to go thru the file and I thought I would create a
ref to store the previous line. When I want to update
the previous line value I can't seem to do it. I've
never used refs before so I'm
I know you are asking about refs, but you might want to think about
using reduce to walk the line-seq. the nature of reduce lets you have
access to the line-seq, two lines at a time no need for a ref.
On Mon, Nov 24, 2008 at 2:17 PM, Brian Doyle <[EMAIL PROTECTED]> wrote:
> I am parsing a file an
Thanks Kevin, I will try using reduce instead. I would like to know what
I'm doing wrong with updating the ref for future reference. Thanks.
On Mon, Nov 24, 2008 at 3:23 PM, Kevin Downey <[EMAIL PROTECTED]> wrote:
>
> I know you are asking about refs, but you might want to think about
> using r
On Mon, Nov 24, 2008 at 5:17 PM, Brian Doyle <[EMAIL PROTECTED]> wrote:
> I am parsing a file and to compare the current line
> with the previous line of the file. I am using line-seq
> to go thru the file and I thought I would create a
> ref to store the previous line. When I want to update
>
ref-set needs its one set of parens, and the last thing in the ref-set
call needs to be a function either (fn [x] ...) or a symbol for a var
that holds a function
On Mon, Nov 24, 2008 at 2:30 PM, Brian Doyle <[EMAIL PROTECTED]> wrote:
> Thanks Kevin, I will try using reduce instead. I would like
For using references in general, here is a little example:
[EMAIL PROTECTED]:~$ clj
Clojure
user=> (def foo (ref 0))
#'user/foo
user=> foo
#
user=> @foo
0
user=> (ref-set foo 1)
java.lang.IllegalStateException: No transaction running (NO_SOURCE_FILE:0)
user=> (dosync (ref-set foo 1))
1
user=> @fo
On Mon, Nov 24, 2008 at 2:34 PM, Kevin Downey <[EMAIL PROTECTED]> wrote:
> ref-set needs its one set of parens, and the last thing in the ref-set
> call needs to be a function either (fn [x] ...) or a symbol for a var
> that holds a function
I made a mistake here. I was thinking of alter, not ref
Another possible approach. Key idea here is to use partition to create
a sliding window over the lines, plus a sentinel value (I picked "")
before the first line. Pretty sure I like partition over reduce for
this particular example.
(ns examples.convert
(:use [clojure.contrib.duck-stre
Yep, that's just a typo in the email. Something was wrong with my browser
and I
couldn't just paste the code in :(
On Mon, Nov 24, 2008 at 3:33 PM, Shawn Hoover <[EMAIL PROTECTED]>wrote:
> On Mon, Nov 24, 2008 at 5:17 PM, Brian Doyle <[EMAIL PROTECTED]>wrote:
>
>> I am parsing a file and to comp
