[Numpy-discussion] loop vectorization

Thomas K Gamble tkg@lanl....
Fri Mar 11 12:13:38 CST 2011

I have the followin loop in my code:

    for i in range(0, nFrames):
        data += dot(transpose(bipData[:,i,:]), bipData[:,i,:]) 

bipData is a 1024x258x256 double precision float array.

The loop takes all of 15 seconds to run on my computer and, with several 
hundred files to process...

Is there a way to do something like:

data = sum(dot(transpose(bipData), bipData))

with dot done on the desired axis of bipData?
This might give a fair speed increase.  Or perhaps a different approach I'm not 

Thomas K. Gamble
Research Technologist, System/Network Administrator
Chemical Diagnostics and Engineering (C-CDE)
Los Alamos National Laboratory
MS-E543,p:505-665-4323 f:505-665-4267

"There cannot be a crisis next week. My schedule is already full."
    Henry Kissinger
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