[petsc-users] On PCFIELDSPLIT and its implementation

[Edoardo alinovi]

So my cavity has 3x3=9 cells, each cells as a 3x3 block. I get the same
error: [0]PETSC ERROR: Local column sizes 6 do not add up to total number
of columns 9

However I do not define any IS, I just pass an array
to PCFieldSplitSetFields() and thus I do not know how to plot them...
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