[petsc-users] KSP scale problems

NAN ZHAO zhaonanavril at gmail.com
Thu Nov 1 11:49:50 CDT 2012

Dear all,

I am using PETSC to solve a fairly large linear system, petsc sometimes
give me a answer of 10E-8 (but it should be 0). I do some research and
found if I scale some parts of the linear system to a very small scale (for
example I scale the third equation I solve to 1e-6), and PETSC give me the
right answer (I got zero at the place it should be zero). Is any one have
some hint of how to set some parameter in PETSC to archieve this as the
user is not able to set the scale easily.

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