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"I am trying to create the set of 3x3 matrices which have entries in the set [0,1,-1]"

v = []
for x in cartesian_product_iterator([[0,1,-1]]*9):
    v.append(matrix(3,x))

len(v)
19683 
v[0]
[0 0 0] [0 0 0] [0 0 0] 
v[10]
[0 0 0] [0 0 0] [1 0 1]