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Re: vectorization challenge! (help!) [message #54913 is a reply to message #54844]

Wed, 18 July 2007 13:37

Brian Larsen
Messages: 270
Registered: June 2006

Senior Member

There is at least some help I can offer here.

instead of:
if randomu(seed,1) lt cutoff then begin
you can make an array of the random numbers to use in the decision as
a mask and take it out of the loop
swap_mask = randomu(seed, npeeps) lt cutoff
this has the advantage f being a byte array so it is small.

Once you have this mask you only need to loop over the 1's in the mask
which is at least fewer steps.

That is as much as my brain has this second but maybe this will spark
something for you.

Brian

------------------------------------------------------------ ---------------------
Brian Larsen
Boston University
Center for Space Physics

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[Message index]

		vectorization challenge! (help!) By: Conor on Tue, 17 July 2007 09:52
		Re: vectorization challenge! (help!) By: MarioIncandenza on Thu, 19 July 2007 10:56
		Re: vectorization challenge! (help!) By: alvin[1] on Thu, 19 July 2007 09:40
		Re: vectorization challenge! (help!) By: Brian Larsen on Thu, 19 July 2007 06:33
		Re: vectorization challenge! (help!) By: mattf on Thu, 19 July 2007 04:53
		Re: vectorization challenge! (help!) By: Maarten[1] on Thu, 19 July 2007 01:35
		Re: vectorization challenge! (help!) By: alvin[1] on Thu, 19 July 2007 01:01
		Re: vectorization challenge! (help!) By: Brian Larsen on Wed, 18 July 2007 13:37

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