Date: 2013-07-02T14:40:19+00:00

Actual source code: ex15.c
petsc-3.4.2 2013-07-02

      2: static char help[] = "Tests Mathematica I/O of vectors and illustrates the use of user-defined event logging.\n\n";

      4: #include <petscvec.h>

      6: /* Note:  Most applications would not read and write a vector within
      7:   the same program.  This example is intended only to demonstrate
      8:   both input and output. */

     12: int main(int argc, char *argv[])
     13: {
     14:   PetscViewer viewer;
     15:   Vec         u;
     16:   PetscScalar v;
     17:   int         VECTOR_GENERATE, VECTOR_READ;
     18:   int         i, m = 10, rank, size, low, high, ldim, iglobal;
     19:   int         ierr;

     21:   PetscInitialize(&argc, &argv, NULL, help);
     22:   MPI_Comm_rank(PETSC_COMM_WORLD, &rank);
     23:   MPI_Comm_size(PETSC_COMM_WORLD, &size);
     24:   PetscOptionsGetInt(NULL, "-m", &m, NULL);

     26:   /* PART 1:  Generate vector, then write it to Mathematica */

     28:   PetscLogEventRegister("Generate Vector", VEC_CLASSID,&VECTOR_GENERATE);
     29:   PetscLogEventBegin(VECTOR_GENERATE, 0, 0, 0, 0);
     30:   /* Generate vector */
     31:   VecCreate(PETSC_COMM_WORLD, &u);
     32:   VecSetSizes(u, PETSC_DECIDE, m);
     33:   VecSetFromOptions(u);
     34:   VecGetOwnershipRange(u, &low, &high);
     35:   VecGetLocalSize(u, &ldim);
     36:   for (i = 0; i < ldim; i++) {
     37:     iglobal = i + low;
     38:     v       = (PetscScalar) (i + 100*rank);
     39:     VecSetValues(u, 1, &iglobal, &v, INSERT_VALUES);
     40:   }
     41:   VecAssemblyBegin(u);
     42:   VecAssemblyEnd(u);
     43:   VecView(u, PETSC_VIEWER_STDOUT_WORLD);

     45:   PetscPrintf(PETSC_COMM_WORLD, "writing vector to Mathematica...\n");

     47: #if 0
     48:   PetscViewerMathematicaOpen(PETSC_COMM_WORLD, 8000, "192.168.119.1", "Connect", &viewer);
     49:   VecView(u, viewer);
     50: #else
     51:   VecView(u, PETSC_VIEWER_MATHEMATICA_WORLD);
     52: #endif
     53:   v    = 0.0;
     54:   VecSet(u,v);
     55:   PetscLogEventEnd(VECTOR_GENERATE, 0, 0, 0, 0);

     57:   /* All processors wait until test vector has been dumped */
     58:   MPI_Barrier(PETSC_COMM_WORLD);
     59:   PetscSleep(10);

     61:   /* PART 2:  Read in vector in from Mathematica */

     63:   PetscLogEventRegister("Read Vector", VEC_CLASSID,&VECTOR_READ);
     64:   PetscLogEventBegin(VECTOR_READ, 0, 0, 0, 0);
     65:   PetscPrintf(PETSC_COMM_WORLD, "reading vector from Mathematica...\n");
     66:   /* Read new vector in binary format */
     67: #if 0
     68:   PetscViewerMathematicaGetVector(viewer, u);
     69:   PetscViewerDestroy(&viewer);
     70: #else
     71:   PetscViewerMathematicaGetVector(PETSC_VIEWER_MATHEMATICA_WORLD, u);
     72: #endif
     73:   PetscLogEventEnd(VECTOR_READ, 0, 0, 0, 0);
     74:   VecView(u, PETSC_VIEWER_STDOUT_WORLD);

     76:   /* Free data structures */
     77:   VecDestroy(&u);
     78:   PetscFinalize();
     79:   return 0;
     80: }