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Re: renaming a variable without making a copy [message #69014 is a reply to message #68923]

Wed, 09 December 2009 07:02

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article <hfmki3$1tf$1@aioe.org>, mgalloy <mgalloy@gmail.com> wrote:

> IDL can handle temporary variables differently. It knows the result of
> the expression
>
> tempVar + 1
>
> can be placed right back into the temporary variable. It also knows that
> when assigning a temporary variable to a new variable name, as in
>
> A = temporary(A) + 1
>
> the "assignment" can just attached the name "A" and change the metadata
> of the variable to indicate that it is no longer a temporary variable.

Thanks, Mike. After reading your post I found the Temporary Variables
page in the IDL internals documentation, which is actually relatively
clear:

"IDL maintains a pool of nameless variables known as temporary variables.
These variables are used by the interpreter to hold temporary results
from evaluating expressions, and are also used within system procedures
and functions that need temporary workspace. In addition, system
functions often obtain a temporary variable to return the result of
their operation to the interpreter."

Ken

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[Message index]

		Re: renaming a variable without making a copy By: David Fanning on Wed, 09 December 2009 05:19
		Re: renaming a variable without making a copy By: lecacheux.alain on Wed, 09 December 2009 01:42
		Re: renaming a variable without making a copy By: David Fanning on Tue, 08 December 2009 14:39
		Re: renaming a variable without making a copy By: Michael Galloy on Tue, 08 December 2009 14:39
		Re: renaming a variable without making a copy By: Kenneth P. Bowman on Tue, 08 December 2009 13:51
		Re: renaming a variable without making a copy By: David Higgins on Tue, 08 December 2009 06:51
		Re: renaming a variable without making a copy By: David Fanning on Tue, 08 December 2009 05:18
		Re: renaming a variable without making a copy By: Kenneth P. Bowman on Wed, 09 December 2009 07:02
		Re: renaming a variable without making a copy By: R.Bauer on Wed, 09 December 2009 09:06
		Re: renaming a variable without making a copy By: lecacheux.alain on Wed, 09 December 2009 06:33

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