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Re: Array indexing "Feature" [message #28464 is a reply to message #28463]

Wed, 12 December 2001 15:03

Jeff Jones
Messages: 2
Registered: February 2001

Junior Member

Andrew Cool wrote:

> Hi All,
>
> One of my colleagues has noted something apparently screwy in the
> indexing of
> arrays.
>
> e.g. a = indgen(10)
> print, a(9) -> you get 9
> print, a(10) -> you get an error, as expected for a zero-based
> index
>
> but if you access the array with the index as a vector, it seems to
> truncate the index to the maximum allowable:
>
> print, a([10]) -> you get 9
> print, a([666]) -> you get 9
>
> Similarly:
>
> print, a(-1) -> you get an error
> print, a([-1]) -> you get 0
>
> This feature holds good for IDL 5.2 and 5.4 on OpenVMS and for 5.5 on
> Windows.
>
> Where, Oh where in the manuals does it describe this?
>
> Andrew

It's funny -- my office mate noticed the same thing just yesterday.

It _is_ documented, in the section on "Array Subscripts" in "Building IDL
Applications". (The exact page depends on the version of the doc. My v5.0 book has
it on page 62.)

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[Message index]

		Re: Array indexing "Feature" By: Pavel A. Romashkin on Mon, 17 December 2001 09:40
		Re: Array indexing "Feature" By: k-bowman on Thu, 13 December 2001 08:35
		Re: Array indexing "Feature" By: Liam E. Gumley on Thu, 13 December 2001 07:23
		Re: Array indexing "Feature" By: Paul van Delst on Thu, 13 December 2001 06:17
		Re: Array indexing "Feature" By: David Fanning on Wed, 12 December 2001 16:48
		Re: Array indexing "Feature" By: Kristine Hensel on Wed, 12 December 2001 16:31
		Re: Array indexing "Feature" By: Andrew Cool on Wed, 12 December 2001 16:10
		Re: Array indexing "Feature" By: Jeff Jones on Wed, 12 December 2001 15:03
		Re: Array indexing "Feature" By: Paul van Delst on Wed, 12 December 2001 14:44
		Re: Array indexing "Feature" By: Craig Markwardt on Wed, 12 December 2001 14:28
		Re: Array indexing "Feature" By: David Fanning on Wed, 12 December 2001 14:12

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