RE: Setting tolerance/number of iterations for iterative solvers

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1

Hi,

Could you let me know how to change the number of iterations in NG-solve when solving the linear systems using the default in-built local preconditioners?

It appears to be set as a maximum of 100. I would like to increase this.

Thanks

Ben

2

Hi Ben,

calling for example help(solvers.CG) from python shows the keyword arguments that the iterative solver CG takes.

For the number of iterations (for CG, MinRes, QMR, GMRes) use maxsteps= (PreconditionedRichardson has the keyword “maxit”) and for the tolerance the keyword is “tol”.

Best wishes,
Henry

3

Actually, for MinResSolver, the keyword is “maxiter”.