Speed up python code for computing matrix cofactors

Question

As part of a complex task, I need to compute matrix cofactors. I did this in a straightforward way using this nice code for computing matrix minors. Here is my code:

Answer 1

The calculation of np.array(range(row)+range(row+1,nrows))[:,np.newaxis] does not depended on col so you could could move that outside the inner loop and cache the value. Depending on the number of columns you have this might give a small optimization.