Actual source code: ex47.c

  2: static char help[] = "Tests the various routines in MatBAIJ format.\n\
  3: Input arguments are:\n\
  4:   -f <input_file> : file to load.  For a 5X5 example of the 5-pt. stencil,\n\
  5:                     use the file petsc/src/mat/examples/matbinary.ex\n\n";

  7: #include <petscmat.h>

 11: int main(int argc,char **args)
 12: {
 13:   Mat               A,B,C;
 14:   PetscViewer       va,vb,vc;
 15:   Vec               x,y;
 16:   PetscErrorCode    ierr;
 17:   PetscInt          i,j,row,m,n,ncols1,ncols2,ct,m2,n2;
 18:   const PetscInt    *cols1,*cols2;
 19:   char              file[PETSC_MAX_PATH_LEN];
 20:   PetscBool         tflg;
 21:   PetscScalar       rval;
 22:   const PetscScalar *vals1,*vals2;
 23:   PetscReal         norm1,norm2,rnorm;
 24:   PetscRandom       r;


 27:   PetscInitialize(&argc,&args,(char *)0,help);
 28: #if defined(PETSC_USE_COMPLEX)
 29:   SETERRQ(PETSC_COMM_WORLD,1,"This example does not work with complex numbers");
 30: #else
 31: 
 32:   PetscOptionsGetString(PETSC_NULL,"-f",file,PETSC_MAX_PATH_LEN,PETSC_NULL);

 34:   /* Load the matrix as AIJ format */
 35:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&va);
 36:   MatCreate(PETSC_COMM_WORLD,&A);
 37:   MatSetType(A,MATSEQAIJ);
 38:   MatLoad(A,va);
 39:   PetscViewerDestroy(&va);

 41:   /* Load the matrix as BAIJ format */
 42:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&vb);
 43:   MatCreate(PETSC_COMM_WORLD,&B);
 44:   MatSetType(B,MATSEQBAIJ);
 45:   MatLoad(B,vb);
 46:   PetscViewerDestroy(&vb);

 48:   /* Load the matrix as BAIJ format */
 49:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&vc);
 50:   MatCreate(PETSC_COMM_WORLD,&C);
 51:   MatSetType(C,MATSEQBAIJ);
 52:   MatLoad(C,vc);
 53:   PetscViewerDestroy(&vc);

 55:   MatGetSize(A,&m,&n);
 56:   MatGetSize(B,&m2,&n2);
 57:   if (m!=m2) SETERRQ(PETSC_COMM_SELF,1,"Matrices are of different size. Cannot run this example");
 58: 
 59:   /* Test MatEqual() */
 60:   MatEqual(B,C,&tflg);
 61:   if (!tflg) SETERRQ(PETSC_COMM_SELF,1,"MatEqual() failed");

 63:   /* Test MatGetDiagonal() */
 64:    VecCreateSeq(PETSC_COMM_SELF,m,&x);
 65:    VecCreateSeq(PETSC_COMM_SELF,m,&y);

 67:   MatGetDiagonal(A,x);
 68:   MatGetDiagonal(B,y);
 69: 
 70:   VecEqual(x,y,&tflg);
 71:   if (!tflg)  SETERRQ(PETSC_COMM_SELF,1,"MatGetDiagonal() failed");

 73:   /* Test MatDiagonalScale() */
 74:   PetscRandomCreate(PETSC_COMM_SELF,&r);
 75:   PetscRandomSetFromOptions(r);
 76:   VecSetRandom(x,r);
 77:   VecSetRandom(y,r);

 79:   MatDiagonalScale(A,x,y);
 80:   MatDiagonalScale(B,x,y);
 81:   MatMult(A,x,y);
 82:   VecNorm(y,NORM_2,&norm1);
 83:   MatMult(B,x,y);
 84:   VecNorm(y,NORM_2,&norm2);
 85:   rnorm = ((norm1-norm2)*100)/norm1;
 86:   if (rnorm<-0.1 || rnorm>0.01) {
 87:     PetscPrintf(PETSC_COMM_SELF,"Norm1=%e Norm2=%e\n",norm1,norm2);
 88:     SETERRQ(PETSC_COMM_SELF,1,"MatDiagonalScale() failed");
 89:   }

 91:   /* Test MatGetRow()/ MatRestoreRow() */
 92:   for (ct=0; ct<100; ct++) {
 93:     PetscRandomGetValue(r,&rval);
 94:     row  = (int)(rval*m);
 95:     MatGetRow(A,row,&ncols1,&cols1,&vals1);
 96:     MatGetRow(B,row,&ncols2,&cols2,&vals2);
 97: 
 98:     for (i=0,j=0; i<ncols1 && j<ncols2; i++) {
 99:       while (cols2[j] != cols1[i]) j++;
100:       if (vals1[i] != vals2[j]) SETERRQ(PETSC_COMM_SELF,1,"MatGetRow() failed - vals incorrect.");
101:     }
102:     if (i<ncols1) SETERRQ(PETSC_COMM_SELF,1,"MatGetRow() failed - cols incorrect");
103: 
104:     MatRestoreRow(A,row,&ncols1,&cols1,&vals1);
105:     MatRestoreRow(B,row,&ncols2,&cols2,&vals2);
106:   }
107: 
108:   MatDestroy(&A);
109:   MatDestroy(&B);
110:   MatDestroy(&C);
111:   VecDestroy(&x);
112:   VecDestroy(&y);
113:   PetscRandomDestroy(&r);
114:   PetscFinalize();
115: #endif
116:   return 0;
117: }