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array indexing question [message #31442]

Thu, 11 July 2002 15:57

mmiller3
Messages: 81
Registered: January 2002

Member

I'm doing some calculations to calculate mutual information and I
have a question about the most efficient/slickest way to
calculate the sum. I wonder if there is a loop-free way to do
this.

I have three arrays, pa, pb and pab. pa and pb are both 1D
arrays of length N and pab is a 2D NxN array. I want to
calculate the sum of pab[i,j]*alog(pab[i,j])/pa[i]/pb[j]. I know
that I can do things like total( pa * alog(pa) ) when I'm dealing
with a single array. Any suggestions for how to do my first sum
most efficiently?

Mike

--
Michael A. Miller mmiller3@iupui.edu
Imaging Sciences, Department of Radiology, IU School of Medicine

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		array indexing question By: mmiller3 on Thu, 11 July 2002 15:57
		Re: Array indexing By: marc schellens[1] on Tue, 16 July 2002 01:50

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