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Re: delete variable name from memory [message #44261 is a reply to message #44259]

Thu, 02 June 2005 09:30

Antonio Santiago
Messages: 201
Registered: February 2004

Senior Member

saplizki@gmail.com wrote:
> I need to delete my variable from the variable name list.
> but i don't locate at the top level (i'm in a gui program) so i can't
> 'delvar' it.
> also i can't (don't want to) zero it because it won't remove from the
> variable list (when i press help or use ROUTINE_NAMES or ROUTINE_INFO)
> and i use that list at my program.
>

Another way to undefine a variable different from David's solution is
with pointers:

IDL> .reset
IDL> a=10
IDL> help
% At $MAIN$
A INT = 10
Compiled Procedures:
$MAIN$

Compiled Functions:

IDL> PTR_FREE, PTR_NEW(a, /NO_COPY)
IDL> help
% At $MAIN$
A UNDEFINED = <Undefined>
Compiled Procedures:
$MAIN$

Compiled Functions:

IDL> ...

The important thing is PTR_NEW(a, /NO_COPY) creates a copy of 'a' into
the HEAP memory and undefines 'a' (with NO_COPY keyword) and returns a
pointer variable that "points" to the HEAP memory. Then we free this
pointer variable.

Also, I suposse (better I'm sure) David's solution is much more good
than this because he use the TEMPORARY function that is desigend for a
similar use that you need.

Bye.

--
-----------------------------------------------------
Antonio Santiago Pï¿½rez
( email: santiago<<at>>grahi.upc.edu )
( www: http://www.grahi.upc.edu/santiago )
( www: http://asantiago.blogsite.org )
-----------------------------------------------------
GRAHI - Grup de Recerca Aplicada en Hidrometeorologia
Universitat Politï¿½cnica de Catalunya
-----------------------------------------------------

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[Message index]

		Re: delete variable name from memory By: JD Smith on Thu, 02 June 2005 10:21
		Re: delete variable name from memory By: Antonio Santiago on Thu, 02 June 2005 09:30
		Re: delete variable name from memory By: David Fanning on Thu, 02 June 2005 05:25
		Re: delete variable name from memory By: saplizki on Sun, 05 June 2005 04:30

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