I'm trying to sum +1 to some specific cells of a numpy array but I can't find any way without slow loops:
coords = np.array([[1,2],[1,2],[1,2],[0,0]])
X = np.zeros((3,3))
for i,j in coords:
X[i,j] +=1
Resulting in:
X = [[ 1. 0. 0.]
[ 0. 0. 3.]
[ 0. 0. 0.]]
X[coords[:,0],coords[:,1] += 1
returns
X = [[ 1. 0. 0.]
[ 0. 0. 1.]
[ 0. 0. 0.]]
Any help?
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