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Re: FOR statement [message #24756 is a reply to message #24755]

Thu, 12 April 2001 09:04

John-David T. Smith is currently offline

John-David T. Smith
Messages: 384
Registered: January 2000

Senior Member

Eli Beckerman wrote:
>
> Hey,
>
> I just tried running a FOR loop in the hopes
> of incrementing the variable "i" by steps of 0.25 as follows:
>
> radius=fltarr(1000)
> FOR i=0.0, 100.0, 0.25 DO BEGIN
>
> radius(i)=i
>
> ENDFOR
>
> And what I end up with is an array that starts
> with the value 0.75 and is incremented by steps of 1.
>
> I'm following the convention of the FOR statement as
> presented in IDL's online help. What am I doing wrong?!

Indexing an array with a floating point number.

try:

FOR i=0.0, 100.0, 0.25 DO BEGIN radius[4*i]=i

or even better:

radius=findgen(401)/4.

JD

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[Message index]

		Re: FOR statement By: Eli Beckerman on Fri, 13 April 2001 13:17
		Re: FOR statement By: Liam E. Gumley on Thu, 12 April 2001 14:04
		Re: FOR statement By: Eli Beckerman on Thu, 12 April 2001 12:41
		Re: FOR statement By: Craig Markwardt on Thu, 12 April 2001 09:18
		Re: FOR statement By: Liam E. Gumley on Thu, 12 April 2001 09:15
		Re: FOR statement By: Liam E. Gumley on Thu, 12 April 2001 09:12
		Re: FOR statement By: Paul van Delst on Thu, 12 April 2001 08:57
		Re: FOR statement By: John-David T. Smith on Thu, 12 April 2001 09:04

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