[petsc-users] Convergence Criteria?

[Alan Wei]

Dear folks,
    I hope you guys are having a nice day.
    I'm reading the /src/ksp/ksp/examples/tutorials/ex29.c.html and wonder
how to set up the convergence criteria? Currently I use it as a poisson
solver to solve a Poisson Equation with three direction Neumann BC's and one
direction Diriechlet BC's. It seems very bad on it.

thanks in advance,
Alan
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