Compare the accuracy of PETSc's GMRES algorithm with Matlab's

[jiaxun hou]

Hello everyone,

I want to solve a linear system with no preconditioned GMRES in PETSc, but the result is divergent. White I solve the exactly same system under Matlab, I get the convergent result. Which result can I trust?

And I print the residuals of them as the attachments. Thanks!

Best regards,
Jiaxun

       
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