[Python-talk] reduction Q

[bruce.labitt at autoliv.com]

There is a generator function that produces as its output 2 arrays, a and 
b.  I'd like to get the average of the ith elements for both arrays.  The 
a and b arrays are the same length, if it matters.

(a,b) = ( myfunc( args ) for f in freqarray )

can I do something like the following?

(suma,sumb) = reduce(add, (a, b))   # this stops the generator chain...

(avga, avgb) = ( suma, sumb)/freqarray.size

example: freqarray has 2 elements, then

a[0,:] = [ 1, 2, 3, ..., 300]                   b[0,:] = [300, 299, 298, 
..., 1]
a[1,:] = [ 0, 1, 2, ..., 299]                   b[1,:] = [299, 298, 297, 
..., 0]

suma = [ 1, 3, 5, ..., 599]                     sumb = [ 599, 597, 595, 
..., 1]
avga =  [ 0.5, 1.5, 2.5, ..., 145.5]    avgb = [ 599/2., 597/2., 595/2., 
..., 0.5]

I don't want arrays a and b to interact.  Is there a way to do this?  I 
haven't tried this, but it seems like trouble is written all over it :P

Bruce

Bruce Labitt
Autoliv Electronics
1011B Pawtucket Blvd, PO Box 1858
Lowell, MA  01853

Email: bruce.labitt at autoliv.com. 
Tel:  (978) 674-6526
Fax: (978) 674-6581 

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