[Numpy-discussion] Numpy inverse giving incorrect result
Pauli Virtanen
pav at iki.fi
Wed May 23 16:03:59 EDT 2012
23.05.2012 11:22, shbr kirjoitti:
> I am running the following script as a basic input-output model but the
> inverse function is bringing back an incorrect result (I have checked this
> by inputting the data manually).I am very new to python but I assume the
> error occurs in how the data is gathered from the csv but I don’t know how
> to fix this. Any advice would be much appreciated.
>From your explanation it is unfortunately not clear what actually does
not work, and what you would expect as results. Can you clarify?
The inverse certainly gives the correct result:
>>> conMatrix = numpy.matrix('0.4102 0.0301 0.0257; 0.0624 0.3783 0.1050; 0.1236 0.1588 0.1919')
>>> eyesee = numpy.eye(3) - conMatrix
>>> eyesee.I
matrix([[ 1.72033888, 0.10060528, 0.06778402],
[ 0.22456355, 1.67684212, 0.22502129],
[ 0.30725724, 0.34490452, 1.29205728]])
>>> eyesee.I * eyesee
matrix([[ 1.00000000e+00, -3.46944695e-18, 0.00000000e+00],
[ 2.42861287e-17, 1.00000000e+00, 0.00000000e+00],
[ 2.77555756e-17, 0.00000000e+00, 1.00000000e+00]])
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