Actual source code: ex31.c

petsc-3.12.2 2019-11-22
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  1: static const char help[] = "Demonstrates PetscMatlabEngineXXX()\n";

  3:  #include <petscvec.h>
  4:  #include <petscmatlab.h>

  6: int main(int argc,char **argv)
  7: {
  9:   PetscMPIInt    rank;
 10:   PetscInt       n = 5;
 11:   char           *output;
 12:   Vec            x;

 14:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;

 16:   VecCreate(PETSC_COMM_WORLD,&x);
 17:   VecSetSizes(x,PETSC_DECIDE,n);
 18:   VecSetFromOptions(x);

 20:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 21:   PetscMatlabEngineGetOutput(PETSC_MATLAB_ENGINE_WORLD,&output);
 22:   PetscMatlabEngineEvaluate(PETSC_MATLAB_ENGINE_WORLD,"MPI_Comm_rank");
 23:   PetscSynchronizedPrintf(PETSC_COMM_WORLD,"[%d]Processor rank is %s",rank,output);
 24:   PetscSynchronizedFlush(PETSC_COMM_WORLD,PETSC_STDOUT);

 26:   PetscObjectSetName((PetscObject)x,"x");
 27:   PetscMatlabEnginePut(PETSC_MATLAB_ENGINE_WORLD,(PetscObject)x);
 28:   PetscMatlabEngineEvaluate(PETSC_MATLAB_ENGINE_WORLD,"x = x + MPI_Comm_rank;\n");
 29:   PetscMatlabEngineGet(PETSC_MATLAB_ENGINE_WORLD,(PetscObject)x);

 31:   PetscMatlabEngineEvaluate(PETSC_MATLAB_ENGINE_WORLD,"whos\n");
 32:   PetscSynchronizedPrintf(PETSC_COMM_WORLD,"[%d]The result is %s",rank,output);
 33:   PetscSynchronizedFlush(PETSC_COMM_WORLD,PETSC_STDOUT);

 35:   VecView(x,PETSC_VIEWER_STDOUT_WORLD);
 36:   VecDestroy(&x);
 37:   PetscFinalize();
 38:   return ierr;
 39: }