comp.lang.idl-pvwave archive: archive » Re: How to change the increment of FOR loop?

Home » Public Forums » archive » Re: How to change the increment of FOR loop?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: How to change the increment of FOR loop? [message #65602 is a reply to message #65589]

Wed, 11 March 2009 14:42

Hu
Messages: 35
Registered: January 2009

Member

On Mar 11, 4:24 pm, FÖLDY Lajos <fo...@rmki.kfki.hu> wrote:
> On Wed, 11 Mar 2009, Hu wrote:
>> Hi, there
>> I got a question relating to the variational increment of FOR
>> Statement. I used the code like this:
>> ;;; begin
>> increment =20
>> FOR j = 0, N-1, increment DO BEGIN
>> IF a gt 0 THEN BEGIN
>> ;......
>> increment=10
>> ENDIF ELSE BEGIN
>> ;......
>> increment=12
>> ENDELSE
>> ENDFOR
>> ;; end
>
>> But the increment have not changed according to IF... ELSE ...
>> statement..
>> What I want is to change the increment according to different
>> conditions. that is, if variable a is greater than 0, the increment of
>> the FOR loop will be 10 , not its default value 20.....
>
>> Is there any solution to this problem?
>
> increment is evaluated only once, before the loop starts (and it is copied
> to a temporary variable you can not reach). You have to create a loop
> manually:
>
> j=0
> increment=20
> while 1 do begin
>
> IF a gt 0 THEN BEGIN
> ;......
> increment=10
> ENDIF ELSE BEGIN
> ;......
> increment=12
> ENDELSE
>
> j=j+increment
> if j ge n then break
>
> endwhile
>
> regards,
> lajos

thank you very much
wishes

Report message to a moderator

[Message index]

		Re: How to change the increment of FOR loop? By: Allan Whiteford on Thu, 12 March 2009 05:24
		Re: How to change the increment of FOR loop? By: Hu on Wed, 11 March 2009 14:42
		Re: How to change the increment of FOR loop? By: Foldy Lajos on Wed, 11 March 2009 14:24
		Re: How to change the increment of FOR loop? By: Foldy Lajos on Fri, 13 March 2009 03:31

Previous Topic:	computer internet
Next Topic:	eclipse and mercurial

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 15:29:51 PDT 2025

Total time taken to generate the page: 1.12436 seconds