[Numpy-discussion] How to remove any row or column of a numpy matrix whose sum is 3?

bob tnur bobtnur78 at gmail.com
Mon Jun 4 12:21:02 EDT 2012


 Hello every body. I am new to python.
How to remove any row or column of a numpy matrix whose sum is 3.
To obtain and save new matrix P with (sum(anyrow)!=3 and sum(anycolumn)!=3
elements.

I tried like this:

P = M[np.logical_not( (M[n,:].sum()==3) & (M[:,n].sum()==3))]
or
P = M[np.logical_not( (np.sum(M[n,:])==3) & (np.sum(M[:,n])==3))]


M is the nxn numpy matrix.
But I got indexerror. So can anyone correct this or any other elegant way
of doing this?

Thanks for your help
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