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<div class="">If you are requesting a Vec from a Plex, then the discretization in its DS determines its size.</div>
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<div class="">What if I have multiple fields on a single DM with varying numComponents per field (although each one has the same quadrature number and dimension I believe)? Does it just make the vec based on field 0? I have made a PetscFE, and used it to set
each field, then called DMCreateDS on the dm afterwards. </div>
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<div>Best,</div>
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<div>Jacob</div>
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<div class="">On Oct 4, 2019, at 4:59 PM, Matthew Knepley <<a href="mailto:knepley@gmail.com" class="">knepley@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">On Fri, Oct 4, 2019 at 3:09 PM Faibussowitsch, Jacob <<a href="mailto:jfaibussowitsch@anl.gov" class="">jfaibussowitsch@anl.gov</a>> wrote:<br class="">
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<div class="">Note that Paraview already knows the cell number and can display it</div>
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Now that would have been useful to know months ago.<br class="">
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<div class="">Here is me making a similar field containing the rank instead of the cell number:</div>
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Yes I ended up cannibalizing that function and this worked well enough. One thing I noticed however is that it the global vector this creates is of the size of number of cells, but when I create a global vector it is the size of num vertices.</div>
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<div class="">If you are requesting a Vec from a Plex, then the discretization in its DS determines its size. You need to</div>
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<div class=""> make a clone (DMClone) and set a P0 discretization</div>
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<div class="">This is what I do there.</div>
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<div class="">I omitted the PETSc__rank_ options prefix part when creating the default fe, is that responsible for setting the vec size here?</div>
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<div class="">Best,</div>
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<div class="">On Oct 4, 2019, at 9:42 AM, Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank" class="">knepley@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">On Thu, Oct 3, 2019 at 11:42 AM Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank" class="">knepley@gmail.com</a>> wrote:<br class="">
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<div dir="ltr" class="">On Tue, Oct 1, 2019 at 11:57 AM Faibussowitsch, Jacob via petsc-dev <<a href="mailto:petsc-dev@mcs.anl.gov" target="_blank" class="">petsc-dev@mcs.anl.gov</a>> wrote:<br class="">
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Hello All,<br class="">
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I am plotting an output value from a vecview, and want to show in a separate plot which cells correspond to which values in the vec. I plan to do this by making a field on the cells whose value is the global number of that cell. I have 2 issues with this:<br class="">
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1. How do I guarantee that the ordering of the Vec I made corresponds to the DMPlex cell ordering such that Vec(0) corresponds to Cells(0) etc. (I make the Vec separately from the DM since using DMCreateLocalVector makes a vector on the vertices)<br class="">
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2. I am trying to use DMPlexVTKWriteAll to make my output, so I am adding my field to the DMPlexVTK using PetscViewerVTKAddField, but I can’t seem to get PetscViewerVTKWriteFunction to work properly, and the man pages don’t link to an example. Here is my code
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PetscErrorCode (*PetscViewerVTKWriteFunction) (PetscObject, PetscViewer);<br class="">
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ierr = PetscViewerCreate(comm=PETSC_COMM_WORLD, &vtkviewer);CHKERRQ(ierr);<br class="">
ierr = PetscViewerVTKOpen(comm=PETSC_COMM_WORLD, "mesh.vtk", FILE_MODE_WRITE, &vtkviewer);CHKERRQ(ierr);<br class="">
ierr = PetscViewerSetUp(vtkviewer);CHKERRQ(ierr);<br class="">
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PetscViewerVTKWriteFunction = (CellNum vtkviewer); <span class=""> </span><br class="">
ierr = PetscViewerVTKAddField(vtkviewer, (PetscObject) dm, PetscViewerVTKWriteFunction, PETSC_VTK_CELL_FIELD, PETSC_TRUE, CellNum);CHKERRQ(ierr);<br class="">
ierr = DMPlexVTKWriteAll((PetscObject) dm, vtkviewer);CHKERRQ(ierr);<br class="">
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Any help would be greatly appreciated!<br class="">
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<div class="">I think what you want is to make a Section over cells with 1 dof, fill it with the cell number (from a global numbering), and then view that Vec.</div>
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<div class="">Here is me making a similar field containing the rank instead of the cell number:</div>
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<div class=""> <a href="https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/DMPLEX/DMPlexCreateRankField.html" target="_blank" class="">https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/DMPLEX/DMPlexCreateRankField.html</a></div>
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<div class="">Note that Paraview already knows the cell number and can display it</div>
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<div class=""> Thanks,</div>
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<div class=""> Matt</div>
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<div class=""> Matt</div>
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Best,<br class="">
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Jacob<br class="">
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<div class="">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br class="">
-- Norbert Wiener</div>
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<div class=""><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank" class="">https://www.cse.buffalo.edu/~knepley/</a><br class="">
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<div class="">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br class="">
-- Norbert Wiener</div>
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<div class=""><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank" class="">https://www.cse.buffalo.edu/~knepley/</a></div>
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<div class="">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br class="">
-- Norbert Wiener</div>
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<div class=""><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank" class="">https://www.cse.buffalo.edu/~knepley/</a></div>
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