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Re: How to delete a variable [message #88418 is a reply to message #88412]

Wed, 23 April 2014 10:42

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Wednesday, April 23, 2014 10:30:59 AM UTC-4, Fabien wrote:
> Hi All,
>
>
>
> why did Wayne say that Coyote's UNDEFINE is "less elegant" than the
>
> PTR_NEW() stuff? I am using undefine very often and I was just wondering
>
> if there's a more efficient (but general!) way to get rid of unused
>
> variables within a routine
>

I was using elegant to mean "less coding", i.e. the single statement

Heap_Free, PTR_NEW(x , /No_Copy)

will free any type of IDL variable (so no need to check for the variable type), and the use of SCOPE_VARFETCH() allows one to loop over an arbitrary number of supplied parameters without writing a special case for each one.

But I think that nearly all the CPU time in these procedures is taken up with actually freeing the memory, so I am fairly certain that that delvarx.pro is no more efficient than undefine.pro. And my original reason for the post was that some IDL V7.0 Linux users found that Heap_Free could be extremely slow. I still don't know the cause of this problem (it is only known to occur so far on CentOS Linux with IDL 7.0), but it does suggest that the Coyote undefine.pro might be more reliable than delvarx.pro

--Wayne

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[Message index]

		How to delete a variable By: wlandsman on Fri, 18 April 2014 12:29
		Re: How to delete a variable By: David Fanning on Fri, 18 April 2014 13:24
		Re: How to delete a variable By: wlandsman on Fri, 18 April 2014 13:31
		Re: How to delete a variable By: jigga1206 on Fri, 18 April 2014 13:29
		Re: How to delete a variable By: Fabzi on Wed, 23 April 2014 07:30
		Re: How to delete a variable By: David Fanning on Wed, 23 April 2014 07:34
		Re: How to delete a variable By: Craig Markwardt on Wed, 23 April 2014 08:09
		Re: How to delete a variable By: David Fanning on Wed, 23 April 2014 08:38
		Re: How to delete a variable By: wlandsman on Wed, 23 April 2014 10:42

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