C++ (Cpp) DSViewMat Examples

Example #1

PetscErrorCode DSView_NHEP(DS ds,PetscViewer viewer)
{
  PetscErrorCode ierr;

  PetscFunctionBegin;
  ierr = DSViewMat(ds,viewer,DS_MAT_A);CHKERRQ(ierr);
  if (ds->state>DS_STATE_INTERMEDIATE) {
    ierr = DSViewMat(ds,viewer,DS_MAT_Q);CHKERRQ(ierr);
  }
  if (ds->mat[DS_MAT_X]) {
    ierr = DSViewMat(ds,viewer,DS_MAT_X);CHKERRQ(ierr);
  }
  if (ds->mat[DS_MAT_Y]) {
    ierr = DSViewMat(ds,viewer,DS_MAT_Y);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

Example #2

File: test10.c Project: OpenCMISS-Dependencies/slepc

int main(int argc,char **argv)
{
  PetscErrorCode ierr;
  DS             ds;
  PetscScalar    *A;
  PetscInt       i,j,n=10,ld;
  PetscViewer    viewer;
  PetscBool      verbose;

  SlepcInitialize(&argc,&argv,(char*)0,help);
  ierr = PetscOptionsGetInt(NULL,"-n",&n,NULL);CHKERRQ(ierr);
  ierr = PetscPrintf(PETSC_COMM_WORLD,"Compute symmetric matrix exponential - dimension %D.\n",n);CHKERRQ(ierr);
  ierr = PetscOptionsHasName(NULL,"-verbose",&verbose);CHKERRQ(ierr);

  /* Create DS object */
  ierr = DSCreate(PETSC_COMM_WORLD,&ds);CHKERRQ(ierr);
  ierr = DSSetType(ds,DSHEP);CHKERRQ(ierr);
  ierr = DSSetFromOptions(ds);CHKERRQ(ierr);
  ld = n+2;  /* test leading dimension larger than n */
  ierr = DSAllocate(ds,ld);CHKERRQ(ierr);
  ierr = DSSetDimensions(ds,n,0,0,0);CHKERRQ(ierr);

  /* Set up viewer */
  ierr = PetscViewerASCIIGetStdout(PETSC_COMM_WORLD,&viewer);CHKERRQ(ierr);
  ierr = PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_INFO_DETAIL);CHKERRQ(ierr);
  ierr = DSView(ds,viewer);CHKERRQ(ierr);
  ierr = PetscViewerPopFormat(viewer);CHKERRQ(ierr);
  if (verbose) {
    ierr = PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_MATLAB);CHKERRQ(ierr);
  }

  /* Fill with a symmetric Toeplitz matrix */
  ierr = DSGetArray(ds,DS_MAT_A,&A);CHKERRQ(ierr);
  for (i=0;i<n;i++) A[i+i*ld]=2.0;
  for (j=1;j<3;j++) {
    for (i=0;i<n-j;i++) { A[i+(i+j)*ld]=1.0; A[(i+j)+i*ld]=1.0; }
  }
  ierr = DSRestoreArray(ds,DS_MAT_A,&A);CHKERRQ(ierr);
  ierr = DSSetState(ds,DS_STATE_RAW);CHKERRQ(ierr);
  if (verbose) {
    ierr = PetscPrintf(PETSC_COMM_WORLD,"Matrix A - - - - - - - -\n");CHKERRQ(ierr);
    ierr = DSView(ds,viewer);CHKERRQ(ierr);
  }

  /* Compute matrix exponential */
  ierr = DSComputeFunction(ds,SLEPC_FUNCTION_EXP);CHKERRQ(ierr);
  if (verbose) {
    ierr = PetscPrintf(PETSC_COMM_WORLD,"Computed f(A) - - - - - - -\n");CHKERRQ(ierr);
    ierr = DSViewMat(ds,viewer,DS_MAT_F);CHKERRQ(ierr);
  }

  ierr = DSDestroy(&ds);CHKERRQ(ierr);
  ierr = SlepcFinalize();
  return 0;
}