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Re: Oh No... [message #53588 is a reply to message #53500]

Wed, 18 April 2007 11:01

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On Apr 18, 7:45 am, Paolo Grigis <pgri...@astro.phys.ethz.ch> wrote:
> FÖLDY Lajos wrote:
>
>> No, invalid code, with undefined result :-)

I don't think it invalid or undefined (very confusing, yes). a is
created and used to index itself following the "normal" rules of
indexing in IDL.

Remember that it is valid to use an index array that has indices out
of range, they are simply brought back into range:

IDL> b = findgen(10)
IDL> b[[-1, 20]] = 1
IDL> print, b
1.00000 1.00000 2.00000 3.00000 4.00000
5.00000 6.00000
7.00000 8.00000 1.00000

You can turn this behavior off with COMPILE_OPT:

IDL> compile_opt strictarrsubs
IDL> a[(a=2*findgen(10))]=1
% Array used to subscript array contains out of range subscript: A.
% Execution halted at: $MAIN$

Mike
--
www.michaelgalloy.com

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[Message index]

		Re: Oh No... By: Paolo Grigis on Wed, 18 April 2007 06:45
		Re: Oh No... By: Foldy Lajos on Wed, 18 April 2007 06:04
		Re: Oh No... By: Paolo Grigis on Wed, 18 April 2007 05:38
		Re: Oh No... By: Michael Galloy on Wed, 18 April 2007 11:01

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