Actual source code: ex3.c

  2: static char help[] = "Tests DAGetInterpolation for nonuniform DA coordinates.\n\n";

 4:  #include petscda.h
 5:  #include petscsys.h

  9: PetscErrorCode SetCoordinates1d(DA da)
 10: {
 12:   PetscInt       i,start,m;
 13:   Vec            gc,global;
 14:   PetscScalar    *coors;
 15:   DA             cda;

 18:   DASetUniformCoordinates(da,0.0,1.0,0.0,1.0,0.0,1.0);
 19:   DAGetCoordinateDA(da,&cda);
 20:   DAGetGhostedCoordinates(da,&gc);
 21:   DAVecGetArray(cda,gc,&coors);
 22:   DAGetCorners(cda,&start,0,0,&m,0,0);
 23:   for (i=start; i<start+m; i++) {
 24:     if (i % 2) {
 25:       coors[i] = coors[i-1] + .1*(coors[i+1] - coors[i-1]);
 26:     }
 27:   }
 28:   DAVecRestoreArray(cda,gc,&coors);
 29:   VecDestroy(gc);
 30:   DAGetCoordinates(da,&global);
 31:   DALocalToGlobal(cda,gc,INSERT_VALUES,global);
 32:   VecDestroy(global);
 33:   DADestroy(cda);
 34:   return(0);
 35: }

 39: PetscErrorCode SetCoordinates2d(DA da)
 40: {
 42:   PetscInt       i,j,mstart,m,nstart,n;
 43:   Vec            gc,global;
 44:   DACoor2d       **coors;
 45:   DA             cda;

 48:   DASetUniformCoordinates(da,0.0,1.0,0.0,1.0,0.0,1.0);
 49:   DAGetCoordinateDA(da,&cda);
 50:   DAGetGhostedCoordinates(da,&gc);
 51:   DAVecGetArray(cda,gc,&coors);
 52:   DAGetCorners(cda,&mstart,&nstart,0,&m,&n,0);
 53:   for (i=mstart; i<mstart+m; i++) {
 54:     for (j=nstart; j<nstart+n; j++) {
 55:       if (i % 2) {
 56:         coors[j][i].x = coors[j][i-1].x + .1*(coors[j][i+1].x - coors[j][i-1].x);
 57:       }
 58:       if (j % 2) {
 59:         coors[j][i].y = coors[j-1][i].y + .3*(coors[j+1][i].y - coors[j-1][i].y);
 60:       }
 61:     }
 62:   }
 63:   DAVecRestoreArray(cda,gc,&coors);
 64:   VecDestroy(gc);
 65:   DAGetCoordinates(da,&global);
 66:   DALocalToGlobal(cda,gc,INSERT_VALUES,global);
 67:   VecDestroy(global);
 68:   DADestroy(cda);
 69:   return(0);
 70: }

 74: PetscErrorCode SetCoordinates3d(DA da)
 75: {
 77:   PetscInt       i,j,mstart,m,nstart,n,pstart,p,k;
 78:   Vec            gc,global;
 79:   DACoor3d       ***coors;
 80:   DA             cda;

 83:   DASetUniformCoordinates(da,0.0,1.0,0.0,1.0,0.0,1.0);
 84:   DAGetCoordinateDA(da,&cda);
 85:   DAGetGhostedCoordinates(da,&gc);
 86:   DAVecGetArray(cda,gc,&coors);
 87:   DAGetCorners(cda,&mstart,&nstart,&pstart,&m,&n,&p);
 88:   for (i=mstart; i<mstart+m; i++) {
 89:     for (j=nstart; j<nstart+n; j++) {
 90:       for (k=pstart; k<pstart+p; k++) {
 91:         if (i % 2) {
 92:           coors[k][j][i].x = coors[k][j][i-1].x + .1*(coors[k][j][i+1].x - coors[k][j][i-1].x);
 93:         }
 94:         if (j % 2) {
 95:           coors[k][j][i].y = coors[k][j-1][i].y + .3*(coors[k][j+1][i].y - coors[k][j-1][i].y);
 96:         }
 97:         if (k % 2) {
 98:           coors[k][j][i].z = coors[k-1][j][i].z + .4*(coors[k+1][j][i].z - coors[k-1][j][i].z);
 99:         }
100:       }
101:     }
102:   }
103:   DAVecRestoreArray(cda,gc,&coors);
104:   VecDestroy(gc);
105:   DAGetCoordinates(da,&global);
106:   DALocalToGlobal(cda,gc,INSERT_VALUES,global);
107:   VecDestroy(global);
108:   DADestroy(cda);
109:   return(0);
110: }

114: int main(int argc,char **argv)
115: {
116:   PetscInt       M = 5,N = 4,P = 3, m = PETSC_DECIDE,n = PETSC_DECIDE,p = PETSC_DECIDE,dim = 1;
118:   DA             dac,daf;
119:   DAPeriodicType ptype = DA_NONPERIODIC;
120:   DAStencilType  stype = DA_STENCIL_BOX;
121:   Mat            A;

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

125:   /* Read options */
126:   PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
127:   PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
128:   PetscOptionsGetInt(PETSC_NULL,"-P",&P,PETSC_NULL);
129:   PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
130:   PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
131:   PetscOptionsGetInt(PETSC_NULL,"-p",&p,PETSC_NULL);
132:   PetscOptionsGetInt(PETSC_NULL,"-dim",&dim,PETSC_NULL);

134:   /* Create distributed array and get vectors */
135:   if (dim == 1) {
136:     DACreate1d(PETSC_COMM_WORLD,ptype,M,1,1,PETSC_NULL,&dac);
137:   } else if (dim == 2) {
138:     DACreate2d(PETSC_COMM_WORLD,ptype,stype,M,N,PETSC_DECIDE,PETSC_DECIDE,1,1,PETSC_NULL,PETSC_NULL,&dac);
139:   } else if (dim == 3) {
140:     DACreate3d(PETSC_COMM_WORLD,ptype,stype,M,N,P,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,1,1,PETSC_NULL,PETSC_NULL,PETSC_NULL,&dac);
141:   }

143:   DARefine(dac,PETSC_COMM_WORLD,&daf);

145:   DASetUniformCoordinates(dac,0.0,1.0,0.0,1.0,0.0,1.0);
146:   if (dim == 1) {
147:     SetCoordinates1d(daf);
148:   } else if (dim == 2) {
149:     SetCoordinates2d(daf);
150:   } else if (dim == 3) {
151:     SetCoordinates3d(daf);
152:   }
153:   DAGetInterpolation(dac,daf,&A,0);


156:   /* Free memory */
157:   DADestroy(dac);
158:   DADestroy(daf);
159:   MatDestroy(A);
160:   PetscFinalize();
161:   return 0;
162: }
163: