[petsc-users] how do you calculate the relative tolerance

[Ning Li]

Hello,

I am trying to compare PETSc and Lis libraries.

In PETSc I could use absolute or relative tolerance. I want to know what is your definition of relative tolerance?

In Lis, they have 3 convergence conditions:
[cid:image001.png at 01D802FC.1A405EF0]

Thanks

Ning Li

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