[Numpy-discussion] performance issue (again)

Mathew Yeates myeates@jpl.nasa....
Tue Apr 21 16:58:03 CDT 2009


Hi
I posted something about this earlier

Say I have 2 arrays X and Y with shapes (N,3) where N is large
I am doing the following

for row in range(N):
    result=polyfit(X[row,:],Y[row,:],1,full=True) # fit 3 points with a line

This takes forever and I was hoping to find a way to speed things up. 
But now I'm starting to wonder if this pointless. If the routine "poly 
fit takes a  long time, when compared with the time for a Python 
function call, then things can't be sped up.

Any comments?

Mathew


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