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Re: Array indexing problem [message #37858 is a reply to message #37853]

Wed, 28 January 2004 13:43

hunter
Messages: 9
Registered: June 2003

Junior Member

You can also turn off this feature if it offends.

compile_opt strictarrsubs

And you will get an error for the example you mentioned above.

Eli

"David Fanning" <david@dfanning.com> wrote in message
news:MPG.1a81d8b95abba27f9897bd@news.frii.com...
> Roy writes:
>
>> Is there any existing code that will catch the below IDL simple
>> example? Input a and b must be an array.
>>
>>
>> Input is an array:
>> IDL> b=[4]
>> IDL> a=[0,1,2]
>> IDL> print,a[b]
>> 2
>> This should give me an error.
>
> Alas, you have run into a little known, but enormously
> appreciated, little feature of IDL. (I'm sure it is
> explained in the manuals somewhere. :-)
>
> Maybe something like this for an error handler:
>
> IF Total(b GT ((N_Elements(a) -1)) GT 0 THEN $
> Message, 'B indices exceed bounds of A'
>
> Cheers,
>
> David
> --
> David W. Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Phone: 970-221-0438, E-mail: david@dfanning.com
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: Array indexing problem By: kashyap on Thu, 29 January 2004 15:21
		Re: Array indexing problem By: David Fanning on Thu, 29 January 2004 09:58
		Re: Array indexing problem By: Liam Gumley on Thu, 29 January 2004 09:43
		Re: Array indexing problem By: roberson_1 on Thu, 29 January 2004 09:03
		Re: Array indexing problem By: hunter on Wed, 28 January 2004 13:43
		Re: Array indexing problem By: Mark Hadfield on Wed, 28 January 2004 16:55
		Re: Array indexing problem By: David Fanning on Wed, 28 January 2004 14:40
		Re: Array indexing problem By: Paul Van Delst[1] on Wed, 28 January 2004 14:28
		Re: Array indexing problem By: Michael Wallace on Wed, 28 January 2004 14:23
		Re: Array indexing problem By: Liam Gumley on Wed, 28 January 2004 14:11
		Re: Array indexing problem By: David Fanning on Wed, 28 January 2004 13:34

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