[petsc-users] Doubt related to MatSetValues()

[Kaushik Kulkarni]

After preallocating a matrix do I have to change the way in which I have to
use the function MatSetValues(). The reason I am asking this is that when I
am executing the code with the line "
*MatMPIAIJSetPreallocation(A,dnz,PETSC_NULL,0,PETSC_NULL);*" in which dnz
is computed for each row and all the off diagonal terms are zero I am
getting an error:
"
*[0]PETSC ERROR:Argument out of range[0]PETSC ERROR: New nonzero at (0,4)
caused a malloc*"

But when I am commenting the line corresponding to the Preallocation, the
code is running fine.

Thank you,

*Kaushik*
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