The I
attribute only exists on matrix
objects, not ndarray
s. You can use numpy.linalg.inv
to invert arrays:
inverse = numpy.linalg.inv(x)
Note that the way you’re generating matrices, not all of them will be invertible. You will either need to change the way you’re generating matrices, or skip the ones that aren’t invertible.
try: inverse = numpy.linalg.inv(x) except numpy.linalg.LinAlgError: # Not invertible. Skip this one. pass else: # continue with what you were doing
Also, if you want to go through all 3×3 matrices with elements drawn from [0, 10), you want the following:
for comb in itertools.product(range(10), repeat=9):
rather than combinations_with_replacement
, or you’ll skip matrices like
numpy.array([[0, 1, 0], [0, 0, 0], [0, 0, 0]])
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