comp.lang.idl-pvwave archive: archive » Re: Array indexing problem

Home » Public Forums » archive » Re: Array indexing problem

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Array indexing problem [message #37867 is a reply to message #37858]

Wed, 28 January 2004 13:34

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

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

Report message to a moderator

[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

Previous Topic:	Re: V5.6 to V6.0 license server question
Next Topic:	Rapid "moving windows" access in IDL?

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 03:20:23 PDT 2025

Total time taken to generate the page: 1.20275 seconds