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Re: IDL FOR Loop variable increments [message #62609 is a reply to message #62608]

Thu, 18 September 2008 14:52

Jean H.
Messages: 472
Registered: July 2006

Senior Member

> I think you have clearly chosen the wrong program
> construction. You should NEVER be changing a loop
> variable inside the loop programmatically. (I don't
> think IDL 7 even allows it, since I was inadvertently
> doing it the other day and got my hand slapped.) Maybe
> you want a WHILE loop.

No problem to do that here..
{ x86 Win32 Windows Microsoft Windows 7.0.1 Mar 20 2008 32 64}

pro del
for i=0,10 do begin
if i eq 5 then i = 8
print,i
endfor
end

==>
0
1
2
3
4
8
9
10

Could you comment on the "risk" of changing the loop counter within the
loop?

Jean

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[Message index]

		Re: IDL FOR Loop variable increments By: raghuram on Mon, 22 September 2008 08:54
		Re: IDL FOR Loop variable increments By: raghuram on Sun, 21 September 2008 15:37
		Re: IDL FOR Loop variable increments By: Wasit.Weather on Sun, 21 September 2008 06:44
		Re: IDL FOR Loop variable increments By: raghuram on Fri, 19 September 2008 22:51
		Re: IDL FOR Loop variable increments By: pgrigis on Fri, 19 September 2008 12:09
		Re: IDL FOR Loop variable increments By: raghuram on Fri, 19 September 2008 12:07
		Re: IDL FOR Loop variable increments By: R.G. Stockwell on Fri, 19 September 2008 11:53
		Re: IDL FOR Loop variable increments By: MarioIncandenza on Fri, 19 September 2008 09:53
		Re: IDL FOR Loop variable increments By: pgrigis on Fri, 19 September 2008 07:26
		Re: IDL FOR Loop variable increments By: David Fanning on Fri, 19 September 2008 06:13
		Re: IDL FOR Loop variable increments By: Carsten Lechte on Fri, 19 September 2008 01:09
		Re: IDL FOR Loop variable increments By: Carsten Lechte on Fri, 19 September 2008 01:07
		Re: IDL FOR Loop variable increments By: raghuram on Thu, 18 September 2008 18:31
		Re: IDL FOR Loop variable increments By: David Fanning on Thu, 18 September 2008 15:46
		Re: IDL FOR Loop variable increments By: Jean H. on Thu, 18 September 2008 15:00
		Re: IDL FOR Loop variable increments By: Jean H. on Thu, 18 September 2008 14:52
		Re: IDL FOR Loop variable increments By: pgrigis on Thu, 18 September 2008 13:23
		Re: IDL FOR Loop variable increments By: David Fanning on Thu, 18 September 2008 13:03
		Re: IDL FOR Loop variable increments By: Jeremy Bailin on Tue, 23 September 2008 07:48

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