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Hello, I cannot fetch right values of a local vector after a second time calling DMSetLocalSection. My program runs like ==================== call PetscSectionSetup(section1,ierr) call DMSetLocalSection(dm_mesh,section1,ierr)call PetscSectionDestroy(section1,ierr)call
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<div dir="ltr"><span class="gmail-im" style="color:rgb(80,0,80)"><div><span style="color:rgb(0,0,0)">Hello,</span><font color="#000000"><br></font></div><div><span style="color:rgb(0,0,0)"><br></span></div><div><span style="color:rgb(0,0,0)">I cannot fetch </span>right values of a local vector after a second time calling DMSetLocalSection. My program runs like</div><div><span style="color:rgb(0,0,0)"><br></span></div><div><font color="#000000">====================</font></div><div>call PetscSectionSetup(section1,ierr)<font color="#000000"><br></font></div><div>call DMSetLocalSection(dm_mesh,section1,ierr)<br></div><div>call PetscSectionDestroy(section1,ierr)</div><div><br></div><div>call DMCreateGlobalVector(dm_mesh,vec_a,ierr)<br></div><div><br></div><div>call VecDestroy(vec_a,ierr)<br></div></span><div>call DMClearLocalVectors(dm_mesh, ierr);<br></div><span class="gmail-im" style="color:rgb(80,0,80)"><div><br></div><div>call PetscSectionSetup(section2,ierr)<br></div><div>call DMSetLocalSection(dm_mesh,section2,ierr)<br></div><div><br></div><div>call DMCreateGlobalVector(dm_mesh,vec_a,ierr)<br></div></span><div>call DMGetLocalVector(dm_mesh,lvec,ierr);<br>call DMGlobalToLocal(dm_mesh,vec_a,INSERT_VALUES,lvec,ierr)<br>call VecGetArrayReadF90(lvec,tempv,ierr)<br>call VecGetArrayReadF90(vec_a,tempv1,ierr)<br>========================</div><div><br></div><div>In this program, I got two Fortran style arrays, <i><u><b>tempv</b></u></i> and <u><b><i>tempv1</i></b></u>, from a Vec <b><i><u>vec_a</u></i></b>. When only 1 cpu is used, those two arrays should be completely the same. Am I right? But I found there are differences as follows:</div><div><br></div><div>* In array <i><u><b>tempv</b></u></i>, dofs newly introduced by section2 are zero valued. Looks like those values are ignored by DMGlobalToLocal. But in array <u><b><i>tempv1</i></b></u>, all dofs values are set correctly. </div><div><br></div><div>Did I do something wrong in the above code?<br class="gmail-Apple-interchange-newline"></div><div><br></div><div><div>Much thanks for your help.</div><div><br></div><div>X. Yuan, Ph.D. in Solid Mechanics</div></div></div>