Hi,

Let the linear systemAx=b.

I am looking for literature describing how changes on coefficients matrixAaffect the solution of the systemx.

For example if the value of the (i,j) element is doubled how this will affect the solutionx?

Are there standard techniques applying to any linear system?

The A matrix is not known a priori and is quite large (thousands of equations), so techniques involving analytic solutions won't be of any help