Given two arrays, A and B:
A=np.array([0,4,2])
B=np.array([0,8,4])
I want to know if I can multiply A by a scalar (x) and get B (A*x==B?) and if that is the case I want to know the value of the scalar (in this case 2). I have searched and tried the solve function without luck
If A*x = B, then x = B/A for A ≠ 0.
You can do this:
A=np.array([0,4,2])
B=np.array([0,8,4])
# remove indices where A is null
m = A!=0
# ensure B values are null where A value are null
assert np.allclose(B[~m], 0)
# compute B/A
out = B[m]/A[m]
# ensure all values are (almost) equal
assert np.allclose(out-out[0], 0)
# print result
print(out[0])
output: 2.0
