solving linear equations in a loop
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The documentation for inv says:
A frequent misuse of inv arises when solving the system of linear equations Ax = b. One way to solve this is with x = inv(A)*b. A better way, from both an execution time and numerical accuracy standpoint, is to use the matrix division operator x = A\b.
The above taken for granted, is it nevertheless reasonable to precalculate invA = inv(A) in front of a loop containing (A\Xi), especially one that necessarily sequential?
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Matt J
2014-3-21
编辑:Matt J
2014-3-21
No. Make the different Xi the columns of matrix, X and just do A\X.
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