Actual source code: test1.c

slepc-3.11.2 2019-07-30
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  1: /*
  2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
  4:    Copyright (c) 2002-2019, Universitat Politecnica de Valencia, Spain

  6:    This file is part of SLEPc.
  7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
  8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  9: */

 11: static char help[] = "Computes exp(t*A)*v for a matrix loaded from file.\n\n"
 12:   "The command line options are:\n"
 13:   "  -t <sval>, where <sval> = scalar value that multiplies the argument.\n"
 14:   "  -file <filename>, where <filename> = matrix file in PETSc binary form.\n\n";

 16: #include <slepcmfn.h>

 18: int main(int argc,char **argv)
 19: {
 20:   Mat                A;           /* problem matrix */
 21:   MFN                mfn;
 22:   FN                 f;
 23:   PetscReal          norm;
 24:   PetscScalar        t=2.0;
 25:   Vec                v,y;
 26:   PetscErrorCode     ierr;
 27:   PetscViewer        viewer;
 28:   PetscBool          flg;
 29:   char               filename[PETSC_MAX_PATH_LEN];
 30:   MFNConvergedReason reason;

 32:   SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;

 34:   PetscOptionsGetScalar(NULL,NULL,"-t",&t,NULL);
 35:   PetscPrintf(PETSC_COMM_WORLD,"\nMatrix exponential y=exp(t*A)*e, loaded from file\n\n");

 37:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 38:                 Load matrix A from binary file
 39:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 41:   PetscOptionsGetString(NULL,NULL,"-file",filename,PETSC_MAX_PATH_LEN,&flg);
 42:   if (!flg) SETERRQ(PETSC_COMM_WORLD,1,"Must indicate a file name with the -file option");

 44: #if defined(PETSC_USE_COMPLEX)
 45:   PetscPrintf(PETSC_COMM_WORLD," Reading COMPLEX matrix from a binary file...\n");
 46: #else
 47:   PetscPrintf(PETSC_COMM_WORLD," Reading REAL matrix from a binary file...\n");
 48: #endif
 49:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer);
 50:   MatCreate(PETSC_COMM_WORLD,&A);
 51:   MatSetFromOptions(A);
 52:   MatLoad(A,viewer);
 53:   PetscViewerDestroy(&viewer);

 55:   /* set v = ones(n,1) */
 56:   MatCreateVecs(A,NULL,&y);
 57:   MatCreateVecs(A,NULL,&v);
 58:   VecSet(v,1.0);

 60:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 61:                 Create the solver and set various options
 62:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 64:   MFNCreate(PETSC_COMM_WORLD,&mfn);
 65:   MFNSetOperator(mfn,A);
 66:   MFNGetFN(mfn,&f);
 67:   FNSetType(f,FNEXP);
 68:   FNSetScale(f,t,1.0);
 69:   MFNSetFromOptions(mfn);

 71:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 72:                       Solve the problem, y=exp(t*A)*v
 73:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 75:   MFNSolve(mfn,v,y);
 76:   MFNGetConvergedReason(mfn,&reason);
 77:   if (reason<0) SETERRQ(PETSC_COMM_WORLD,1,"Solver did not converge");
 78:   VecNorm(y,NORM_2,&norm);
 79:   PetscPrintf(PETSC_COMM_WORLD," Computed vector at time t=%.4g has norm %g\n\n",(double)PetscRealPart(t),(double)norm);

 81:   /*
 82:      Free work space
 83:   */
 84:   MFNDestroy(&mfn);
 85:   MatDestroy(&A);
 86:   VecDestroy(&v);
 87:   VecDestroy(&y);
 88:   SlepcFinalize();
 89:   return ierr;
 90: }

 92: /*TEST

 94:    test:
 95:       suffix: 1
 96:       args: -file ${SLEPC_DIR}/share/slepc/datafiles/matrices/bfw62b.petsc -mfn_type {{krylov expokit}}
 97:       requires: double !complex !define(PETSC_USE_64BIT_INDICES)
 98:       output_file: output/test1.out

100:    test:
101:       suffix: 2
102:       args: -file ${SLEPC_DIR}/share/slepc/datafiles/matrices/bfw62b.petsc -mfn_type {{krylov expokit}} -mat_type aijcusparse
103:       requires: cuda double !complex !define(PETSC_USE_64BIT_INDICES)
104:       output_file: output/test1.out

106: TEST*/