Actual source code: ex28.c

  2: static char help[] = "Tests repeated VecDotBegin()/VecDotEnd().\n\n";

 4:  #include petscvec.h

  8: int main(int argc,char **argv)
  9: {
 11:   PetscInt       n = 25,i,row0 = 0;
 12:   PetscScalar    one = 1.0,two = 2.0,result1,result2,results[40],value,ten = 10.0;
 13:   PetscScalar    result1a,result2a;
 14:   PetscReal      result3,result4,result[2],result3a,result4a,resulta[2];
 15:   Vec            x,y,vecs[40];

 17:   PetscInitialize(&argc,&argv,(char*)0,help);

 19:   /* create vector */
 20:   VecCreate(PETSC_COMM_WORLD,&x);
 21:   VecSetSizes(x,n,PETSC_DECIDE);
 22:   VecSetFromOptions(x);
 23:   VecDuplicate(x,&y);

 25:   VecSet(x,one);
 26:   VecSet(y,two);

 28:   /*
 29:         Test mixing dot products and norms that require sums
 30:   */
 31:   result1 = result2 = 0.0;
 32:   result3 = result4 = 0.0;
 33:   VecDotBegin(x,y,&result1);
 34:   VecDotBegin(y,x,&result2);
 35:   VecNormBegin(y,NORM_2,&result3);
 36:   VecNormBegin(x,NORM_1,&result4);
 37:   VecDotEnd(x,y,&result1);
 38:   VecDotEnd(y,x,&result2);
 39:   VecNormEnd(y,NORM_2,&result3);
 40:   VecNormEnd(x,NORM_1,&result4);
 41: 
 42:   VecDot(x,y,&result1a);
 43:   VecDot(y,x,&result2a);
 44:   VecNorm(y,NORM_2,&result3a);
 45:   VecNorm(x,NORM_1,&result4a);
 46: 
 47:   if (result1 != result1a || result2 != result2a) {
 48:     PetscPrintf(PETSC_COMM_WORLD,"Error dot: result1 %G result2 %G\n",PetscRealPart(result1),PetscRealPart(result2));
 49:   }
 50:   if (result3 != result3a || result4 != result4a) {
 51:     PetscPrintf(PETSC_COMM_WORLD,"Error 1,2 norms: result3 %G result4 %G\n",result3,result4);
 52:   }

 54:   /*
 55:         Test norms that only require abs
 56:   */
 57:   result1 = result2 = 0.0;
 58:   result3 = result4 = 0.0;
 59:   VecNormBegin(y,NORM_MAX,&result3);
 60:   VecNormBegin(x,NORM_MAX,&result4);
 61:   VecNormEnd(y,NORM_MAX,&result3);
 62:   VecNormEnd(x,NORM_MAX,&result4);

 64:   VecNorm(x,NORM_MAX,&result4a);
 65:   VecNorm(y,NORM_MAX,&result3a);
 66:   if (result3 != result3a || result4 != result4a) {
 67:     PetscPrintf(PETSC_COMM_WORLD,"Error max norm: result3 %G result4 %G\n",result3,result4);
 68:   }

 70:   /*
 71:         Tests dot,  max, 1, norm
 72:   */
 73:   result1 = result2 = 0.0;
 74:   result3 = result4 = 0.0;
 75:   VecSetValues(x,1,&row0,&ten,INSERT_VALUES);
 76:   VecAssemblyBegin(x);
 77:   VecAssemblyEnd(x);

 79:   VecDotBegin(x,y,&result1);
 80:   VecDotBegin(y,x,&result2);
 81:   VecNormBegin(x,NORM_MAX,&result3);
 82:   VecNormBegin(x,NORM_1,&result4);
 83:   VecDotEnd(x,y,&result1);
 84:   VecDotEnd(y,x,&result2);
 85:   VecNormEnd(x,NORM_MAX,&result3);
 86:   VecNormEnd(x,NORM_1,&result4);

 88:   VecDot(x,y,&result1a);
 89:   VecDot(y,x,&result2a);
 90:   VecNorm(x,NORM_MAX,&result3a);
 91:   VecNorm(x,NORM_1,&result4a);
 92:   if (result1 != result1a || result2 != result2a) {
 93:     PetscPrintf(PETSC_COMM_WORLD,"Error dot: result1 %G result2 %G\n",PetscRealPart(result1),PetscRealPart(result2));
 94:   }
 95:   if (result3 != result3a || result4 != result4a) {
 96:     PetscPrintf(PETSC_COMM_WORLD,"Error max 1 norms: result3 %G result4 %G\n",result3,result4);
 97:   }

 99:   /*
100:        tests 1_and_2 norm 
101:   */
102:   VecNormBegin(x,NORM_MAX,&result3);
103:   VecNormBegin(x,NORM_1_AND_2,result);
104:   VecNormBegin(y,NORM_MAX,&result4);
105:   VecNormEnd(x,NORM_MAX,&result3);
106:   VecNormEnd(x,NORM_1_AND_2,result);
107:   VecNormEnd(y,NORM_MAX,&result4);

109:   VecNorm(x,NORM_MAX,&result3a);
110:   VecNorm(x,NORM_1_AND_2,resulta);
111:   VecNorm(y,NORM_MAX,&result4a);
112:   if (result3 != result3a || result4 != result4a) {
113:     PetscPrintf(PETSC_COMM_WORLD,"Error max: result1 %G result2 %G\n",result3,result4);
114:   }
115:   if (PetscAbsReal(result[0]-resulta[0]) > .01 || PetscAbsReal(result[1]-resulta[1]) > .01) {
116:     PetscPrintf(PETSC_COMM_WORLD,"Error 1 and 2 norms: result[0] %G result[1] %G\n",result[0],result[1]);
117:   }

119:   VecDestroy(x);
120:   VecDestroy(y);

122:   /*
123:        Tests computing a large number of operations that require 
124:     allocating a larger data structure internally
125:   */
126:   for (i=0; i<40; i++) {
127:     VecCreate(PETSC_COMM_WORLD,vecs+i);
128:     VecSetSizes(vecs[i],PETSC_DECIDE,n);
129:     VecSetFromOptions(vecs[i]);
130:     value = (PetscReal)i;
131:     VecSet(vecs[i],value);
132:   }
133:   for (i=0; i<39; i++) {
134:     VecDotBegin(vecs[i],vecs[i+1],results+i);
135:   }
136:   for (i=0; i<39; i++) {
137:     VecDotEnd(vecs[i],vecs[i+1],results+i);
138:     if (results[i] != 25.0*i*(i+1)) {
139:       PetscPrintf(PETSC_COMM_WORLD,"i %D expected %G got %G\n",i,25.0*i*(i+1),PetscRealPart(results[i]));
140:     }
141:   }
142:   for (i=0; i<40; i++) {
143:     VecDestroy(vecs[i]);
144:   }

146:   PetscFinalize();
147:   return 0;
148: }
149: