Hello everyone,<br><br>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?<br><br>And I print the residuals of them as the attachments. Thanks!<br><br>Best regards,<br>Jiaxun<br><p> 
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