<div dir="ltr"><div>Dear all</div><div><br></div>It depends on the problem. It can have hundreds of thousands of degrees of freedom.<div><br></div><div>best,</div><div><br></div><div>Seung Lee Kwon</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">2023년 4월 25일 (화) 오후 12:32, Barry Smith <<a href="mailto:bsmith@petsc.dev">bsmith@petsc.dev</a>>님이 작성:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div><br></div> How large are the dense matrices you would like to invert?<br><div><br><blockquote type="cite"><div>On Apr 24, 2023, at 11:27 PM, 권승리 / 학생 / 항공우주공학과 <<a href="mailto:ksl7912@snu.ac.kr" target="_blank">ksl7912@snu.ac.kr</a>> wrote:</div><br><div><div dir="ltr">Dear all<div><br></div><div>Hello.</div><div>I want to make an inverse matrix like inv(A) in MATLAB.</div><div><br></div><div>Are there some methods to inverse matrix in petsc?</div><div><br></div><div>If not, I want to use the inverse function in the LAPACK library.</div><div><br></div><div>Then, how to use the LAPACK library in petsc? I use the C language.</div><div><br></div><div>Best,</div><div><br></div><div>Seung Lee Kwon</div><div><div><br></div><span>-- </span><br><div dir="ltr"><div dir="ltr"><div>Seung Lee Kwon, Ph.D.Candidate</div><div>Aerospace Structures and Materials Laboratory</div><div>Department of Mechanical and Aerospace Engineering</div><div>Seoul National University</div><div>Building 300 Rm 503, Gwanak-ro 1, Gwanak-gu, Seoul, South Korea, 08826</div><div>E-mail : <a href="mailto:ksl7912@snu.ac.kr" target="_blank">ksl7912@snu.ac.kr</a></div><div>Office : +82-2-880-7389</div><div>C. P : +82-10-4695-1062</div></div></div></div></div>
</div></blockquote></div><br></div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div>Seung Lee Kwon, Ph.D.Candidate</div><div>Aerospace Structures and Materials Laboratory</div><div>Department of Mechanical and Aerospace Engineering</div><div>Seoul National University</div><div>Building 300 Rm 503, Gwanak-ro 1, Gwanak-gu, Seoul, South Korea, 08826</div><div>E-mail : <a href="mailto:ksl7912@snu.ac.kr" target="_blank">ksl7912@snu.ac.kr</a></div><div>Office : +82-2-880-7389</div><div>C. P : +82-10-4695-1062</div></div></div>