[petsc-users] creating csr matrix from 3 arrays

[Dürrwang, Jürgen]

Hi I am trying to generate a matrix(nxn) from 3 arrays(1D) which I have read from 3 single textfiles:

PetscInt pcol[] (dimension of nz): points to the integer array of length nz that holds the column indices of the corresponding elements in pval
PetscInt prow[] (dimesion of n)
PetscScalar pval[] (dimension of nz)

I tried this:
MatSetValues(A,n,prow,nz,pcol,pval,INSERT_VALUES);
MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

Can I insert the hole data into matrix A or should I loop over it?

Thanks Jürgen

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