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Matrix multiplication error

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Peter
Peter 2012-5-16
I am experiencing a strage error in matlab. I have matrix A and a vector x. I expect that if I perform the following operations, C should equal zero but it does not.
B = A*x;
C = A\B-x;
In fact C is is a vector composed of the same constant. What could possibly cause this in matlab?
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Walter Roberson
Walter Roberson 2012-5-16
This appear to be the same as http://www.mathworks.com/matlabcentral/answers/38567-reversible-matrix-operation

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