2: #include <petscmat.h>

  4: #if !defined(PETSC_USE_64BIT_INDICES)
  5: static char help[] = "Reads in a matrix and vector in ASCII format. Writes\n\
  6: them using the PETSc sparse format. Input parameters are:\n\
  7:   -fin <filename> : input file\n\
  8:   -fout <filename> : output file\n\n";
  9: #endif


 14: int main(int argc,char **args)
 15: {
 16: #if !defined(PETSC_USE_64BIT_INDICES)
 17:   Mat            A;
 18:   Vec            b;
 19:   char           filein[PETSC_MAX_PATH_LEN],finname[PETSC_MAX_PATH_LEN],fileout[PETSC_MAX_PATH_LEN];
 20:   PetscInt       n,col,row,rowin;
 22:   PetscBool      flg;
 23:   PetscScalar    val,*array;
 24:   FILE           *file;
 25:   PetscViewer    view;

 27:   PetscInitialize(&argc,&args,(char*)0,help);

 29:   /* Read in matrix and RHS */
 30:   PetscOptionsGetString(NULL,NULL,"-fin",filein,256,&flg);
 31:   if (!flg) SETERRQ(PETSC_COMM_WORLD,1,"Must indicate file for reading");
 32:   PetscOptionsGetString(NULL,NULL,"-fout",fileout,256,&flg);
 33:   if (!flg) SETERRQ(PETSC_COMM_WORLD,1,"Must indicate file for writing");

 35:   PetscFixFilename(filein,finname);
 36:   if (!(file = fopen(finname,"r"))) SETERRQ(PETSC_COMM_SELF,1,"cannot open input file\n");
 37:   fscanf(file,"%d\n",&n);

 39:   MatCreate(PETSC_COMM_WORLD,&A);
 40:   MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);
 41:   MatSetFromOptions(A);
 42:   VecCreate(PETSC_COMM_WORLD,&b);
 43:   VecSetSizes(b,PETSC_DECIDE,n);
 44:   VecSetFromOptions(b);

 46:   for (row=0; row<n; row++) {
 47:     fscanf(file,"row %d:",&rowin);
 48:     if (rowin != row) SETERRQ(PETSC_COMM_SELF,1,"Bad file");
 49:     while (fscanf(file," %d %le",&col,(double*)&val)) {
 50:       MatSetValues(A,1,&row,1,&col,&val,INSERT_VALUES);
 51:     }
 52:   }
 53:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 54:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
 55:   VecGetArray(b,&array);
 56:   for (row=0; row<n; row++) {
 57:     fscanf(file," ii= %d %le",&col,(double*)(array+row));
 58:   }
 59:   VecRestoreArray(b,&array);

 61:   fclose(file);

 63:   PetscPrintf(PETSC_COMM_SELF,"Reading matrix complete.\n");
 64:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,fileout,FILE_MODE_WRITE,&view);
 65:   MatView(A,view);
 66:   VecView(b,view);
 67:   PetscViewerDestroy(&view);

 69:   VecDestroy(&b);
 70:   MatDestroy(&A);

 72:   PetscFinalize();
 73: #endif
 74:   return 0;
 75: }