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        <span>Dear sir:
        </span></div><div><span>     I generate the 3D mesh with Tetgen for FVM computation.  I reordered the cells and partitioned them with metis.  Then i got an array which records the distribution of each cells.  For example, on CPU -0., I have:</span></div><div><span>      1, 3, 6 , 7 ....11, 22......</span></div><div><span>    But all these cells have non-continuos index, how to set the matrix in petsc.</span></div><div><span>Regards</span></div><div><span>    </span></div>
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