python - Minimum of Numpy Array Ignoring Diagonal -


i have find maximum value of numpy array ignoring diagonal elements.

np.amax() provides ways find ignoring specific axes. how can achieve same ignoring diagonal elements?

you use mask

mask = np.ones(a.shape, dtype=bool) np.fill_diagonal(mask, 0) max_value = a[mask].max()

where a matrix want find max of. mask selects off-diagonal elements, a[mask] long vector of off-diagonal elements. take max.

or, if don't mind modifying original array

np.fill_diagonal(a, -np.inf) max_value = a.max()

of course, can make copy , above without modifying original. also, assuming a floating point format.


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