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For a standard linear system, y(n*1)=A(n*n)x(n*1)

If y is exact and A is well-conditioned, it is easy to calculate x.

However, if y has some disturbances or some errors, at the same time, A matrix is ill-conditioned. It is difficult to accurately obtain vector x. Alternatively, we can measure more components of y (becomes m*1, where m>n) and use the least square method to calculate the approximate x vector.

It is a common problem so I guess there should be some ready-to-use Fortran codes. Anybody knows where can I find this algorithms or codes? Any advice or suggestion is welcomed!

Thank you very much and with best wishes,

Thomas