[petsc-users] MatSetValues problem

[Ramsey, James J CIV (US)]

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The "New nonzero at <fill in the blank> caused a malloc" error looks like what happens if the preallocation is not exact. What happens if you add

call MatSetOption(Kglobal, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE, ierr)

after your call to your preallocation subroutine?
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Oh, of course Kglobal should be replaced by whatever matrix you are trying to set the values of.