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Hello, I found DMGetLocalVector and DMCreateLocalVector generate Vec of different size in my following codes ==================== call PetscSectionSetup(section,ierr) call DMSetLocalSection(dm_mesh,section,ierr) .. . . . . do somethingcall PetscSectionSetup(section,ierr)call
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<div dir="ltr"> <span style="color:rgb(0,0,0)">Hello,</span><div><span style="color:rgb(0,0,0)"><br></span></div><div><span style="color:rgb(0,0,0)">I found </span>DMGetLocalVector and DMCreateLocalVector generate Vec of different size in my following codes</div><div><br></div><div><font color="#000000">====================</font></div><div>call PetscSectionSetup(section,ierr)<font color="#000000"><br></font></div><div>call DMSetLocalSection(dm_mesh,section,ierr)<br></div><div>......do something</div><div><br></div><div>call PetscSectionSetup(section,ierr)<br></div><div>call DMSetLocalSection(dm_mesh,section,ierr)<br></div><div>......</div><div>call DMCreateLocalVector(dm_mesh,lvec,ierr);<br>call DMGetLocalVector(dm_mesh,llvec,ierr);<br>call VecGetSize(lvec,off,ierr)<br>call VecGetSize(llvec,offl,ierr)<br>call VecDestroy(lvec,ierr)<br>call DMRestoreLocalVector(dm_mesh,llvec,ierr);<br>========================<br></div><div>The pointer in the above program is that DMSetLocalSection is called two times. As the petsc manual indicates, "<span style="color:rgb(50,50,50);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";font-size:15px">Any existing Section will be destroyed" after calling this function and To my understanding, a new section should be set. </span>Therefore, The above program should obtain values of <i><u>off</u></i> and <i><u>offl </u></i>the same. However, I found that they are different, with <i><u>off </u></i>equal to the size defined by the new section and <u><i>offl</i></u> equal to the size defined by the first one. </div><div><br></div><div>Any problem in above codes? And how can I obtain a Vector of the same size by DMGetLocalVector and DMCreateLocalVector?</div><div><br></div><div>Much thanks for your help.</div><div><br></div><div>X. Yuan, Ph.D. in Solid Mechanics</div></div>