On 13/07/13 05:05, Jack Little wrote:
Is there a way in python to do matrix multiplication and its inverse? No
external modules is preferred, but it is ok.
If you have numpy, you should use that.
If you want a pure Python version, here's a quick and dirty matrix multiplier
that works only for 2x2 matrices.
def is_matrix(obj):
if len(obj) == 2:
return len(obj[0]) == 2 and len(obj[1]) == 2
return False
def matrix_mult(A, B):
"""Return matrix A x B."""
if not (is_matrix(A) and is_matrix(B)):
raise ValueError('not matrices')
[a, b], [c, d] = A
[w, x], [y, z] = B
return [[a*w + b*y, a*x + b*z],
[c*w + d*y, c*x + d*z]]
I leave the inverse as an exercise :-)
--
Steven
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