Increment given indices in a matrix

Question

Briefly: there is a similar question and the best answer suggests using numpy.bincount. I need the same thing, but for a matrix.

I\'ve got two arrays:

Answer 1

m1 = m.view(numpy.ndarray) # Create view
m1.shape = -1 # Make one-dimensional array
m1 += np.bincount(a+m.shape[1]*b, minlength=m1.size)