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Re: More efficient method of appending to arrays when using pointers? [message #74258 is a reply to message #74164]

Tue, 04 January 2011 19:07

natha
Messages: 482
Registered: October 2007

Senior Member

I don't know but I don't thing so. The use of the TEMPORARY function
allows to save time programming with large amounts of data (in my
experience) I didn't find any contradictions to this.
I think that the use of TEMPORARY is always better. You will lose
efficiency using small data (for example, single scalars or small
arrays).

The simple reason is that you are not duplicating memory. In the case
discussed above, you are not copying the content of your pointer, you
are just retrieving it.

You can do your own tests, for example:

a=PTR_NEW(BYTARR(10000000),/NO_COPY)

tt=SYSTIME(/SEC)
b=*a
PRINT, SYSTIME(/SEC)-tt

tt=SYSTIME(/SEC)
b=TEMPORARY(*a) ;; do not forget that you are losing the content of
your pointer
PRINT, SYSTIME(/SEC)-tt

nata

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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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