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Re: More efficient method of appending to arrays when using pointers? [message #74164]

Tue, 04 January 2011 14:54

Matt Francis
Messages: 94
Registered: May 2010

Member

On Jan 5, 9:44 am, nata <bernat.puigdomen...@gmail.com> wrote:
> Try this:
>
> temp = [ TEMPORARY(*self.foo),next_array ]
> ptr_free,self.foo
> self.free = ptr_new(temp,/NO_COPY)
>
> When you are creating the new pointer you are duplicating memory.
> The same occurs when you are retrieving the content of *self.foo. Use
> the function TEMPORARY and the keyword NO_COPY, your code will be more
> efficient.
>
> Cheers,
> nata

Thanks Nata. I see from the TEMPORARY docs that it works by using some
scratch space IDL keeps allocated on hand. Do you know if there is an
upper limit on the size of the arrays you use this approach with
before you don't gain any efficiency (or start to be slower than not
using TEMPORARY), for instance because you are using more memory than
IDL keeps on hand for use with TEMPORARY?

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[Message index]

		Re: More efficient method of appending to arrays when using pointers? By: Matt Francis on Tue, 04 January 2011 14:54
		Re: More efficient method of appending to arrays when using pointers? By: natha on Tue, 04 January 2011 14:44
		Re: More efficient method of appending to arrays when using pointers? By: Matt Francis on Tue, 04 January 2011 14:39
		Re: More efficient method of appending to arrays when using pointers? By: Gray on Tue, 04 January 2011 14:30
		Re: More efficient method of appending to arrays when using pointers? By: natha on Tue, 04 January 2011 19:07

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