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 example see $PETSC_DIR/share/petsc/datafiles/matrices\n\n";

  6: #include <petscmat.h>

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


 26:   PetscInitialize(&argc,&args,(char*)0,help);
 27: #if defined(PETSC_USE_COMPLEX)
 28:   SETERRQ(PETSC_COMM_WORLD,1,"This example does not work with complex numbers");
 29: #else

 31:   PetscOptionsGetString(NULL,"-f",file,PETSC_MAX_PATH_LEN,NULL);

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

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

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

 54:   MatGetSize(A,&m,&n);
 55:   MatGetSize(B,&m2,&n2);
 56:   if (m!=m2) SETERRQ(PETSC_COMM_SELF,1,"Matrices are of different size. Cannot run this example");

 58:   /* Test MatEqual() */
 59:   MatEqual(B,C,&tflg);
 60:   if (!tflg) SETERRQ(PETSC_COMM_SELF,1,"MatEqual() failed");

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

 66:   MatGetDiagonal(A,x);
 67:   MatGetDiagonal(B,y);

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

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

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

 90:   /* Test MatGetRow()/ MatRestoreRow() */
 91:   for (ct=0; ct<100; ct++) {
 92:     PetscRandomGetValue(r,&rval);
 93:     row  = (int)(rval*m);
 94:     MatGetRow(A,row,&ncols1,&cols1,&vals1);
 95:     MatGetRow(B,row,&ncols2,&cols2,&vals2);

 97:     for (i=0,j=0; i<ncols1 && j<ncols2; i++) {
 98:       while (cols2[j] != cols1[i]) j++;
 99:       if (vals1[i] != vals2[j]) SETERRQ(PETSC_COMM_SELF,1,"MatGetRow() failed - vals incorrect.");
100:     }
101:     if (i<ncols1) SETERRQ(PETSC_COMM_SELF,1,"MatGetRow() failed - cols incorrect");

103:     MatRestoreRow(A,row,&ncols1,&cols1,&vals1);
104:     MatRestoreRow(B,row,&ncols2,&cols2,&vals2);
105:   }

107:   MatDestroy(&A);
108:   MatDestroy(&B);
109:   MatDestroy(&C);
110:   VecDestroy(&x);
111:   VecDestroy(&y);
112:   PetscRandomDestroy(&r);
113:   PetscFinalize();
114: #endif
115:   return 0;
116: }