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Solve ill-condition matrix

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jason law
jason law le 7 Juil 2020
Réponse apportée : M le 8 Juil 2020
How can I solve Ax=B matrix when the command window in matlab mentioned"matrix is badly scaled, singular Rcond 1e-16" something like this
I am using vpa(A), then inv(A) to solve the matrix, but the speed is a bit slow as I need to run for 1e4 times.
What is the difference between using these two methods pinv() and vpa(), inv()?

Réponses (1)

M
M le 8 Juil 2020
Does it display this warning but still solve the equation ? How are the results ?
You can also try : x = A\B . It solves the system of linear equations A*x = B.
From Matlab doc : "If A is a square matrix, then A\B is roughly equal to inv(A)*B, but MATLAB processes A\B differently and more robustly."

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