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Re: Invalid indices? [message #68413 is a reply to message #68412]

Tue, 27 October 2009 11:27

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Lajos writes:

> There is no out of range error for array subscripts, they are always
> clipped. From the docs:
>
> Elements of the subscript array that are negative or larger than the
> highest subscript are clipped to the target array boundaries. Note that a
> common error is to use a negative scalar subscript (e.g., A[-1]). Using
> this type of subscript causes an error. Negative array subscripts (e.g.,
> A[[-1]]) do not cause errors.

Thanks. Much easier than reading the article. I tried it
about a half hour ago, and my eyes are still crossed. :-(

Cheers,

David
--
David Fanning, Ph.D.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Invalid indices? By: Michael Galloy on Wed, 28 October 2009 19:55
		Re: Invalid indices? By: Brian Larsen on Wed, 28 October 2009 16:02
		Re: Invalid indices? By: Michael Galloy on Tue, 27 October 2009 11:48
		Re: Invalid indices? By: David Fanning on Tue, 27 October 2009 11:27
		Re: Invalid indices? By: Foldy Lajos on Tue, 27 October 2009 11:02
		Re: Invalid indices? By: David Fanning on Tue, 27 October 2009 11:00

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