the solver use of amgcl

[gujintian1]

Hello! For AMGCL, if the positions of the non-zero elements in the coefficient matrix A remain unchanged and only the values of the non-zero elements change with each use of the solver, how can one create a solver only once and subsequently update only the values of the non-zero elements in the coefficient matrix A?

[ddemidov]

You could try to use amg::rebuild() method. It requires prm.allow_rebuild set, and propagates the new matrix values down the amg hierarchy.

[gujintian1]

Thank you very much!