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Re: array referencing problem ... [message #43036 is a reply to message #42954]

Wed, 09 March 2005 23:01

marc schellens[1]
Messages: 183
Registered: January 2000

Senior Member

> Here is an article that might help:
>
> http://www.dfanning.com/code_tips/tempvar.html

While this article is still covers the point, its a little bit
outdated:
IDL now correctly complains about the expression.

IDL> p = ptr_new( {a:1, b:2, s:{x:0,y:0, a:[256,256,48]} } )
IDL> ((*p).s.a)[2] = ((*p).s.a)[2] * 4
% Expression must be named variable in this context: <INT
Array[3]>.
% Execution halted at: $MAIN$

But there is still another bug in IDL:

function ret,a
return,a
end

IDL> a=1
IDL> ++(ret(a[0]))
IDL> print,a
1
But this only happens if used as a statement:

IDL> print,++(ret(a[0]))
% Expression must be named variable in this context: <INT (
1)>.
% Execution halted at: $MAIN$

Ah, and did I mention that GDL
(http://gnudatalanguage.sourceforge.net/)
behaves correctly in all cases :-)

Cheers,
marc

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[Message index]

		array referencing problem ... By: Andreas Brunn on Tue, 08 March 2005 08:43
		Re: array referencing problem ... By: marc schellens[1] on Wed, 09 March 2005 23:01
		Re: array referencing problem ... By: David Fanning on Tue, 08 March 2005 16:02

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