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Re: negative indices, am I missing something here? [message #81987 is a reply to message #81986] Fri, 02 November 2012 15:26 Go to previous messageGo to previous message
Michael Galloy is currently offline  Michael Galloy
Messages: 1114
Registered: April 2006
Senior Member
On 11/2/12 3:53 PM, David Fanning wrote:
> fawltylanguage@gmail.com writes:
>
>> Array subscripts are always clipped. From IDL help:
>>
>> "If an element of the subscript array is less than or equal to zero, the first element of the subscripted array is selected. ...
>>
>> Note: Because of the confusion between the clipping of array subscripts and the use of negative indices (see the next section), it is best to avoid using code that relies on this clipping behavior."
>
> You can think of it as karmic justice for sins of the past. ;-)
>
> Cheers,
>
> David
>
>

Might be a good idea to use

compile_opt strictarrsubs

to catch these cases.

Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)
Research Mathematician
Tech-X Corporation

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