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Re: IDL array subscripting issue [message #90228 is a reply to message #90225]

Thu, 12 February 2015 10:05

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David B writes:

>
> Now this is probably a simple and quick problem for someone with experience. I think I may have missed the point or fallen victim to a problem with an obvious solution.
> ===============================
>
> IDL> a = INDGEN(10)
> IDL> b = [0,10]
> IDL> print, a[b]
> 0 9
> IDL> b = [0,9]
> IDL> print, a[b]
> 0 9
>
> ===============================
> Why?!

Here is an explanation:

http://www.idlcoyote.com/code_tips/oobindices.html

This can be a particularly pernicious "bug" to track down in your code.
Personally, I've lost a lot of hair over this one. :-(

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		IDL array subscripting issue By: David B on Thu, 12 February 2015 09:22
		Re: IDL array subscripting issue By: David B on Thu, 12 February 2015 09:23
		Re: IDL array subscripting issue By: Fabzi on Thu, 12 February 2015 09:29
		Re: IDL array subscripting issue By: Paul Van Delst[1] on Thu, 12 February 2015 10:26
		Re: IDL array subscripting issue By: Fabzi on Thu, 12 February 2015 10:36
		Re: IDL array subscripting issue By: David Fanning on Thu, 12 February 2015 10:05
		Re: IDL array subscripting issue By: David B on Fri, 13 February 2015 01:32

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