1*c4762a1bSJed Brown 2*c4762a1bSJed Brown static char help[] = "Tests automatic allocation of matrix storage space.\n\n"; 3*c4762a1bSJed Brown 4*c4762a1bSJed Brown #include <petscmat.h> 5*c4762a1bSJed Brown 6*c4762a1bSJed Brown int main(int argc,char **args) 7*c4762a1bSJed Brown { 8*c4762a1bSJed Brown Mat C; 9*c4762a1bSJed Brown PetscInt i,j,m = 3,n = 3,Ii,J; 10*c4762a1bSJed Brown PetscErrorCode ierr; 11*c4762a1bSJed Brown PetscScalar v; 12*c4762a1bSJed Brown MatInfo info; 13*c4762a1bSJed Brown 14*c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 15*c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);CHKERRQ(ierr); 16*c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);CHKERRQ(ierr); 17*c4762a1bSJed Brown 18*c4762a1bSJed Brown /* create the matrix for the five point stencil, YET AGAIN */ 19*c4762a1bSJed Brown ierr = MatCreate(PETSC_COMM_SELF,&C);CHKERRQ(ierr); 20*c4762a1bSJed Brown ierr = MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n);CHKERRQ(ierr); 21*c4762a1bSJed Brown ierr = MatSetFromOptions(C);CHKERRQ(ierr); 22*c4762a1bSJed Brown ierr = MatSetUp(C);CHKERRQ(ierr); 23*c4762a1bSJed Brown for (i=0; i<m; i++) { 24*c4762a1bSJed Brown for (j=0; j<n; j++) { 25*c4762a1bSJed Brown v = -1.0; Ii = j + n*i; 26*c4762a1bSJed Brown if (i>0) {J=Ii-n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 27*c4762a1bSJed Brown if (i<m-1) {J=Ii+n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 28*c4762a1bSJed Brown if (j>0) {J=Ii-1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 29*c4762a1bSJed Brown if (j<n-1) {J=Ii+1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 30*c4762a1bSJed Brown v = 4.0; ierr = MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES);CHKERRQ(ierr); 31*c4762a1bSJed Brown } 32*c4762a1bSJed Brown } 33*c4762a1bSJed Brown ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 34*c4762a1bSJed Brown ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 35*c4762a1bSJed Brown ierr = MatView(C,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); 36*c4762a1bSJed Brown 37*c4762a1bSJed Brown ierr = MatGetInfo(C,MAT_LOCAL,&info);CHKERRQ(ierr); 38*c4762a1bSJed Brown ierr = PetscPrintf(PETSC_COMM_SELF,"matrix nonzeros = %D, allocated nonzeros = %D\n",(PetscInt)info.nz_used,(PetscInt)info.nz_allocated);CHKERRQ(ierr); 39*c4762a1bSJed Brown 40*c4762a1bSJed Brown ierr = MatDestroy(&C);CHKERRQ(ierr); 41*c4762a1bSJed Brown ierr = PetscFinalize(); 42*c4762a1bSJed Brown return ierr; 43*c4762a1bSJed Brown } 44*c4762a1bSJed Brown 45*c4762a1bSJed Brown 46*c4762a1bSJed Brown /*TEST 47*c4762a1bSJed Brown 48*c4762a1bSJed Brown test: 49*c4762a1bSJed Brown 50*c4762a1bSJed Brown TEST*/ 51