comp.lang.idl-pvwave archive: archive » Re: More efficient method of appending to arrays when using pointers?

Home » Public Forums » archive » Re: More efficient method of appending to arrays when using pointers?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: More efficient method of appending to arrays when using pointers? [message #74170 is a reply to message #74169]

Tue, 04 January 2011 14:30

Gray
Messages: 253
Registered: February 2010

Senior Member

On Jan 4, 5:01 pm, Matt Francis <mattjamesfran...@gmail.com> wrote:
> I have some code I've written that looks clunky and I was wondering if
> there is a more efficient (faster and or using less memory) way to do
> this.
>
> I am using a custom object with a member self.foo which will end up
> being a matrix, built up by appending arrays one at a time as I loop
> over each step of a process. This update code currently looks like
> this:
>
> temp = [ *(self.foo),next_array]
> ptr_free,self.foo
> self.free = ptr_new(temp)
>
> This seems to be a bit wastefull in terms of how many times memory is
> allocated and deallocated to get the job done. Something simple like
>
> self.free = ptr_new([*(self.foo),next_array]
>
> causes a memory leak due to the dangling pointer. I don't see how the
> TEMPORARY function can be used here without causing a leak.
>
> Any tips from the pros?

Why mess about with ptr_new and ptr_free? Unnecessary.

temp = [*self.foo,next_array]
*self.foo = temp

Or, the minimalist approach:

*self.foo = [*self.foo,next_array]

Report message to a moderator

[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

Previous Topic:	How to extract a scalar from a vector?
Next Topic:	Re: Associating GeoTiFF tags with basic Mercator projection parameters?

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 08:57:37 PDT 2025

Total time taken to generate the page: 0.63774 seconds