remove zero lines 2-D numpy array

Question

I run a qr factorization in numpy which returns a list of ndarrays, namely Qand R:

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Answer 1

If you want to eliminate rows that have negligible entries, i'd use np.allclose.

zero_row_indices = [i for i in r.shape[0] if np.allclose(r[i,:],0)]
nonzero_row_indices =[i for i in r.shape[0] if not np.allclose(r[i,:],0)]
r_new = r[nonzero_row_indices,:]