吕超 <[email protected]> writes: > Can you tell me whether I need to caculate the exact diag and > off-diag arrays related to the nonzeros numbers when I use > subroutine MatMPIBAIJSetPreallocationCSR to allocate memory?
If you are asking this question, you should use the simpler MatXAIJSetPreallocation(). You can over-estimate, but do not under-estimate. > I have read this website > > "http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatMPIAIJSetPreallocationCSR.html";, > but I don't understand it clealy. So can you tell me where can I > find the example of MatMPIBAIJSetPreallocationCSR?
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