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Zhaoni,</div>
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petsc-<a href="https://www.mcs.anl.gov/petsc/documentation/changes/34.html" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">3.4</a><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;"> </span><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">-
Public Release, May 13, 2013</span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">i.e., it is a version released 7 years ago. Why you have to use such an old version?</span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">Hong</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> petsc-users <petsc-users-bounces@mcs.anl.gov> on behalf of $B<k><p?(B <zhuzhaoni2017@hnu.edu.cn><br>
<b>Sent:</b> Tuesday, December 29, 2020 2:51 AM<br>
<b>To:</b> petsc-users <petsc-users@mcs.anl.gov><br>
<b>Subject:</b> [petsc-users] Error occurred when version change</font>
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<p class="x_MsoNormal"><span class="x_src"><span lang="EN-US">Dear Sir or Madam:</span></span> </p>
<p class="x_MsoNormal"><span class="x_src"><span lang="EN-US">Hello, I am a new PETSc learner. There are some confusions when I using different versions of PETSc. For some reasons, I have to change my codes from the version 3.6.3 to 3.4.5. Newton methods in
3.6.3 version converged successfully with the time step size dt=100. While with the same dt=100 and almost the same codes, Newton methods in version 3.4.5 failed to converge. The debug test indicated that there may be something wrong during the line search
process. I have tried to search the changes in different versions but failed. Could you please give me some suggestions? Thank you so much.</span></span> </p>
<p class="x_MsoNormal">Best regards,</p>
<p class="x_MsoNormal">Zhaoni Zhu</p>
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