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Re: FOR statement [message #24755 is a reply to message #24754]

Thu, 12 April 2001 08:57

Paul van Delst
Messages: 364
Registered: March 1997

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?!

Try

i=-1L
FOR xi=0.0, 100.0, 0.25 DO BEGIN & i=i+1L & radius(i)=xi & endfor

IDL> print, radius[0:10]
0.00000 0.250000 0.500000 0.750000 1.00000 1.25000
1.50000
1.75000 2.00000 2.25000 2.50000

using i as the array subscript must be converting it to an integer type and screwing stuff
up somehow.

Using loop indices like this should be discouraged, I reckon.

paulv

--
Paul van Delst A little learning is a dangerous thing;
CIMSS @ NOAA/NCEP Drink deep, or taste not the Pierian spring;
Ph: (301)763-8000 x7274 There shallow draughts intoxicate the brain,
Fax:(301)763-8545 And drinking largely sobers us again.
paul.vandelst@noaa.gov Alexander Pope.

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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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