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Re: temporary() problem [message #86025 is a reply to message #86024]

Tue, 24 September 2013 13:32

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

spluque@gmail.com writes:

> I'm not sure I understand why the variable 'a' below gets undefined after calling a procedure using temporary():
>
> IDL> a='a, b, c'
> IDL> help, a
> A STRING = 'a, b, c'
> IDL> .run "test.pro"
> % Compiled module: TEST.
> IDL> test, a
> IDL> help, a
> A UNDEFINED = <Undefined>
>
>
> The contents of test.pro:
>
> PRO TEST, str
> ostr=strsplit(temporary(str), ', ', /extract)
> END
>
>
> Why is temporary() messing with the top level environment?

Because variables are passed by reference in IDL, not by value (copied
into the procedure). In this case, you are working with the variable str
itself, not a copy of the variable.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		temporary() problem By: spluque on Tue, 24 September 2013 13:25
		Re: temporary() problem By: David Fanning on Tue, 24 September 2013 13:32
		Re: temporary() problem By: Paul Van Delst[1] on Tue, 24 September 2013 14:29
		Re: temporary() problem By: David Fanning on Tue, 24 September 2013 14:39
		Re: temporary() problem By: spluque on Tue, 24 September 2013 15:43

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