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<p class="MsoNormal"><span lang="EN-US">Hi all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am a new user of PETSC, and I am trying to use KSP to solve a 3D Poisson problem. The 3D Poisson problem is differenced by myself, which means that matrix A is given already.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have found several examples in KSP tutorials but I want to know which one is suitable for me in “ex2f; ex6f; ex15f; ex21f; ex44f; ex45f”<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks in advance.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Pengyang<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">----------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Pengyang Song</span>（宋朋洋）<span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">MSc candidate in Physical Oceanography<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">College of Oceanic and Atmospheric Sciences<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Ocean University of China<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">No. 238 Songling Road, Qingdao 266100, Shandong, China<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">TEL: (+86) 15762264643<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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