System Preprocessors
testmat.c
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00001     /*
00002      * create a simple matrix and rhs
00003      */
00004     ierr = MatCreateSeqAIJ(MPI_COMM_SELF,n,n,3,0,&A); CHKERRQ(ierr);
00005     ierr = VecCreateSeq(MPI_COMM_SELF,n,&rhs); CHKERRQ(ierr);
00006     for (i=0; i<n; i++) {
00007       if (i>0) {
00008         int ii=i-1;
00009         ierr = MatSetValues(A,1,&i,1,&ii,&mone,INSERT_VALUES); CHKERRQ(ierr);
00010         ierr = MatSetValues(A,1,&ii,1,&i,&mone,INSERT_VALUES); CHKERRQ(ierr);
00011       }
00012       ierr = MatSetValues(A,1,&i,1,&i,&two,INSERT_VALUES); CHKERRQ(ierr);
00013       ierr = VecSetValues(rhs,1,&i,&one,INSERT_VALUES); CHKERRQ(ierr);
00014     }
00015     ierr = MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY); CHKERRQ(ierr);
00016     ierr = MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY); CHKERRQ(ierr);
00017     ierr = VecAssemblyBegin(rhs); CHKERRQ(ierr);
00018     ierr = VecAssemblyEnd(rhs); CHKERRQ(ierr);
00019     ierr = VecDuplicate(rhs,&sol); CHKERRQ(ierr);