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Re: Faster approach for total(data,dimension) possible? [message #67036 is a reply to message #67032]

Thu, 25 June 2009 05:10

wlandsman
Messages: 743
Registered: June 2000

Senior Member

>
>> chris
>
> Dear Chris
> it's me, Chris :) Back to topic: That may be, but nevertheless there
> are routines missing, which can compare a 3D matrix with a 1D vector
> simply and fast. Any other ideas?
>

Check your assumptions. The ideas suggested are all completely
vectorized IDL code and have the same speed to an order of
magnitude. They have some unnecessary computations because every
pixel in each band is checked even if one already knows the column
contains non-zero elements. This should slow the routines down by
about a factor of two from an ideal method.

But if the existing code takes less than a second on all the machines
tested, and takes several minutes on your user's machine, then I would
take a very close look as to whether it is really this section of code
that is causing the problem. --Wayne

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[Message index]

		Re: Faster approach for total(data,dimension) possible? By: rogass on Fri, 26 June 2009 07:44
		Re: Faster approach for total(data,dimension) possible? By: JDS on Thu, 25 June 2009 08:22
		Re: Faster approach for total(data,dimension) possible? By: wlandsman on Thu, 25 June 2009 05:10
		Re: Faster approach for total(data,dimension) possible? By: rogass on Wed, 24 June 2009 23:58
		Re: Faster approach for total(data,dimension) possible? By: Chris[6] on Wed, 24 June 2009 17:46
		Re: Faster approach for total(data,dimension) possible? By: rogass on Wed, 24 June 2009 15:30
		Re: Faster approach for total(data,dimension) possible? By: Jeremy Bailin on Wed, 24 June 2009 14:04
		Re: Faster approach for total(data,dimension) possible? By: Jeremy Bailin on Wed, 24 June 2009 13:53
		Re: Faster approach for total(data,dimension) possible? By: rogass on Wed, 24 June 2009 13:51
		Re: Faster approach for total(data,dimension) possible? By: wlandsman on Wed, 24 June 2009 09:34
		Re: Faster approach for total(data,dimension) possible? By: rogass on Wed, 24 June 2009 08:38
		Re: Faster approach for total(data,dimension) possible? By: Jean H. on Wed, 24 June 2009 07:33
		Re: Faster approach for total(data,dimension) possible? By: wlandsman on Wed, 24 June 2009 07:19
		Re: Faster approach for total(data,dimension) possible? By: Chris[6] on Wed, 24 June 2009 06:35
		Re: Faster approach for total(data,dimension) possible? By: rogass on Wed, 24 June 2009 05:12
		Re: Faster approach for total(data,dimension) possible? By: wlandsman on Wed, 24 June 2009 04:55
		Re: Faster approach for total(data,dimension) possible? By: rogass on Wed, 24 June 2009 04:44
		Re: Faster approach for total(data,dimension) possible? By: wlandsman on Wed, 24 June 2009 04:33
		Re: Faster approach for total(data,dimension) possible? By: wlandsman on Wed, 24 June 2009 04:19

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