Actual source code: gr1.c

  1: #define PETSCDM_DLL

  3: /* 
  4:    Plots vectors obtained with DACreate1d()
  5: */

 7:  #include petscda.h

 11: /*@
 12:     DASetUniformCoordinates - Sets a DA coordinates to be a uniform grid

 14:   Collective on DA

 16:   Input Parameters:
 17: +  da - the distributed array object
 18: .  xmin,xmax - extremes in the x direction
 19: .  ymin,ymax - extremes in the y direction (use PETSC_NULL for 1 dimensional problems)
 20: -  zmin,zmax - extremes in the z direction (use PETSC_NULL for 1 or 2 dimensional problems)

 22:   Level: beginner

 24: .seealso: DASetCoordinates(), DAGetCoordinates(), DACreate1d(), DACreate2d(), DACreate3d()

 26: @*/
 27: PetscErrorCode  DASetUniformCoordinates(DA da,PetscReal xmin,PetscReal xmax,PetscReal ymin,PetscReal ymax,PetscReal zmin,PetscReal zmax)
 28: {
 30:   PetscInt            i,j,k,M,N,P,istart,isize,jstart,jsize,kstart,ksize,dim,cnt;
 31:   PetscReal      hx,hy,hz_;
 32:   Vec            xcoor;
 33:   DAPeriodicType periodic;
 34:   PetscScalar    *coors;

 37:   if (xmax <= xmin) SETERRQ2(PETSC_ERR_ARG_INCOMP,"xmax must be larger than xmin %G %G",xmin,xmax);

 39:   DAGetInfo(da,&dim,&M,&N,&P,0,0,0,0,0,&periodic,0);
 40:   DAGetCorners(da,&istart,&jstart,&kstart,&isize,&jsize,&ksize);

 42:   if (dim == 1) {
 43:     VecCreateMPI(PETSC_COMM_WORLD,isize,PETSC_DETERMINE,&xcoor);
 44:     if (periodic == DA_NONPERIODIC) hx = (xmax-xmin)/(M-1);
 45:     else                            hx = (xmax-xmin)/M;
 46:     VecGetArray(xcoor,&coors);
 47:     for (i=0; i<isize; i++) {
 48:       coors[i] = xmin + hx*(i+istart);
 49:     }
 50:     VecRestoreArray(xcoor,&coors);
 51:   } else if (dim == 2) {
 52:     if (ymax <= ymin) SETERRQ2(PETSC_ERR_ARG_INCOMP,"ymax must be larger than ymin %G %G",ymin,ymax);
 53:     VecCreateMPI(PETSC_COMM_WORLD,2*isize*jsize,PETSC_DETERMINE,&xcoor);
 54:     VecSetBlockSize(xcoor,2);
 55:     if (DAXPeriodic(periodic)) hx = (xmax-xmin)/(M);
 56:     else                       hx = (xmax-xmin)/(M-1);
 57:     if (DAYPeriodic(periodic)) hy = (ymax-ymin)/(N);
 58:     else                       hy = (ymax-ymin)/(N-1);
 59:     VecGetArray(xcoor,&coors);
 60:     cnt  = 0;
 61:     for (j=0; j<jsize; j++) {
 62:       for (i=0; i<isize; i++) {
 63:         coors[cnt++] = xmin + hx*(i+istart);
 64:         coors[cnt++] = ymin + hy*(j+jstart);
 65:       }
 66:     }
 67:     VecRestoreArray(xcoor,&coors);
 68:   } else if (dim == 3) {
 69:     if (ymax <= ymin) SETERRQ2(PETSC_ERR_ARG_INCOMP,"ymax must be larger than ymin %G %G",ymin,ymax);
 70:     if (zmax <= zmin) SETERRQ2(PETSC_ERR_ARG_INCOMP,"zmax must be larger than zmin %G %G",zmin,zmax);
 71:     VecCreateMPI(PETSC_COMM_WORLD,3*isize*jsize*ksize,PETSC_DETERMINE,&xcoor);
 72:     VecSetBlockSize(xcoor,3);
 73:     if (DAXPeriodic(periodic)) hx = (xmax-xmin)/(M);
 74:     else                       hx = (xmax-xmin)/(M-1);
 75:     if (DAYPeriodic(periodic)) hy = (ymax-ymin)/(N);
 76:     else                       hy = (ymax-ymin)/(N-1);
 77:     if (DAZPeriodic(periodic)) hz_ = (zmax-zmin)/(P);
 78:     else                       hz_ = (zmax-zmin)/(P-1);
 79:     VecGetArray(xcoor,&coors);
 80:     cnt  = 0;
 81:     for (k=0; k<ksize; k++) {
 82:       for (j=0; j<jsize; j++) {
 83:         for (i=0; i<isize; i++) {
 84:           coors[cnt++] = xmin + hx*(i+istart);
 85:           coors[cnt++] = ymin + hy*(j+jstart);
 86:           coors[cnt++] = zmin + hz_*(k+kstart);
 87:         }
 88:       }
 89:     }
 90:     VecRestoreArray(xcoor,&coors);
 91:   } else {
 92:     SETERRQ1(PETSC_ERR_SUP,"Cannot create uniform coordinates for this dimension %D\n",dim);
 93:   }
 94:   DASetCoordinates(da,xcoor);
 95:   PetscLogObjectParent(da,xcoor);

 97:   return(0);
 98: }

102: PetscErrorCode VecView_MPI_Draw_DA1d(Vec xin,PetscViewer v)
103: {
104:   DA             da;
106:   PetscMPIInt    rank,size,tag1,tag2;
107:   PetscInt       i,n,N,step,istart,isize,j;
108:   MPI_Status     status;
109:   PetscReal      coors[4],ymin,ymax,min,max,xmin,xmax,tmp,xgtmp;
110:   PetscScalar    *array,*xg;
111:   PetscDraw      draw;
112:   PetscTruth     isnull,showpoints;
113:   MPI_Comm       comm;
114:   PetscDrawAxis  axis;
115:   Vec            xcoor;
116:   DAPeriodicType periodic;

119:   PetscViewerDrawGetDraw(v,0,&draw);
120:   PetscDrawIsNull(draw,&isnull); if (isnull) return(0);

122:   PetscObjectQuery((PetscObject)xin,"DA",(PetscObject*)&da);
123:   if (!da) SETERRQ(PETSC_ERR_ARG_WRONG,"Vector not generated from a DA");

125:   PetscOptionsHasName(PETSC_NULL,"-draw_vec_mark_points",&showpoints);

127:   DAGetInfo(da,0,&N,0,0,0,0,0,&step,0,&periodic,0);
128:   DAGetCorners(da,&istart,0,0,&isize,0,0);
129:   VecGetArray(xin,&array);
130:   VecGetLocalSize(xin,&n);
131:   n    = n/step;

133:   /* get coordinates of nodes */
134:   DAGetCoordinates(da,&xcoor);
135:   if (!xcoor) {
136:     DASetUniformCoordinates(da,0.0,1.0,0.0,0.0,0.0,0.0);
137:     DAGetCoordinates(da,&xcoor);
138:   }
139:   VecGetArray(xcoor,&xg);

141:   PetscObjectGetComm((PetscObject)xin,&comm);
142:   MPI_Comm_size(comm,&size);
143:   MPI_Comm_rank(comm,&rank);

145:   /*
146:       Determine the min and max x coordinate in plot 
147:   */
148:   if (!rank) {
149:     xmin = PetscRealPart(xg[0]);
150:   }
151:   if (rank == size-1) {
152:     xmax = PetscRealPart(xg[n-1]);
153:   }
154:   MPI_Bcast(&xmin,1,MPIU_REAL,0,comm);
155:   MPI_Bcast(&xmax,1,MPIU_REAL,size-1,comm);

157:   for (j=0; j<step; j++) {
158:     PetscViewerDrawGetDraw(v,j,&draw);
159:     PetscDrawCheckResizedWindow(draw);

161:     /*
162:         Determine the min and max y coordinate in plot 
163:     */
164:     min = 1.e20; max = -1.e20;
165:     for (i=0; i<n; i++) {
166: #if defined(PETSC_USE_COMPLEX)
167:       if (PetscRealPart(array[j+i*step]) < min) min = PetscRealPart(array[j+i*step]);
168:       if (PetscRealPart(array[j+i*step]) > max) max = PetscRealPart(array[j+i*step]);
169: #else
170:       if (array[j+i*step] < min) min = array[j+i*step];
171:       if (array[j+i*step] > max) max = array[j+i*step];
172: #endif
173:     }
174:     if (min + 1.e-10 > max) {
175:       min -= 1.e-5;
176:       max += 1.e-5;
177:     }
178:     MPI_Reduce(&min,&ymin,1,MPIU_REAL,MPI_MIN,0,comm);
179:     MPI_Reduce(&max,&ymax,1,MPIU_REAL,MPI_MAX,0,comm);

181:     PetscDrawSynchronizedClear(draw);
182:     PetscViewerDrawGetDrawAxis(v,j,&axis);
183:     PetscLogObjectParent(draw,axis);
184:     if (!rank) {
185:       char *title;

187:       PetscDrawAxisSetLimits(axis,xmin,xmax,ymin,ymax);
188:       PetscDrawAxisDraw(axis);
189:       PetscDrawGetCoordinates(draw,coors,coors+1,coors+2,coors+3);
190:       DAGetFieldName(da,j,&title);
191:       if (title) {PetscDrawSetTitle(draw,title);}
192:     }
193:     MPI_Bcast(coors,4,MPIU_REAL,0,comm);
194:     if (rank) {
195:       PetscDrawSetCoordinates(draw,coors[0],coors[1],coors[2],coors[3]);
196:     }

198:     /* draw local part of vector */
199:     PetscObjectGetNewTag((PetscObject)xin,&tag1);
200:     PetscObjectGetNewTag((PetscObject)xin,&tag2);
201:     if (rank < size-1) { /*send value to right */
202:       MPI_Send(&array[j+(n-1)*step],1,MPIU_REAL,rank+1,tag1,comm);
203:       MPI_Send(&xg[n-1],1,MPIU_REAL,rank+1,tag1,comm);
204:     }
205:     if (!rank && periodic) { /* first processor sends first value to last */
206:       MPI_Send(&array[j],1,MPIU_REAL,size-1,tag2,comm);
207:     }

209:     for (i=1; i<n; i++) {
210: #if !defined(PETSC_USE_COMPLEX)
211:       PetscDrawLine(draw,xg[i-1],array[j+step*(i-1)],xg[i],array[j+step*i],
212:                       PETSC_DRAW_RED);
213: #else
214:       PetscDrawLine(draw,PetscRealPart(xg[i-1]),PetscRealPart(array[j+step*(i-1)]),
215:                       PetscRealPart(xg[i]),PetscRealPart(array[j+step*i]),PETSC_DRAW_RED);
216: #endif
217:       if (showpoints) {
218:         PetscDrawPoint(draw,PetscRealPart(xg[i-1]),PetscRealPart(array[j+step*(i-1)]),PETSC_DRAW_BLACK);
219:       }
220:     }
221:     if (rank) { /* receive value from left */
222:       MPI_Recv(&tmp,1,MPIU_REAL,rank-1,tag1,comm,&status);
223:       MPI_Recv(&xgtmp,1,MPIU_REAL,rank-1,tag1,comm,&status);
224: #if !defined(PETSC_USE_COMPLEX)
225:       PetscDrawLine(draw,xgtmp,tmp,xg[0],array[j],PETSC_DRAW_RED);
226: #else
227:       PetscDrawLine(draw,xgtmp,tmp,PetscRealPart(xg[0]),PetscRealPart(array[j]),
228:                       PETSC_DRAW_RED);
229: #endif
230:       if (showpoints) {
231:         PetscDrawPoint(draw,xgtmp,tmp,PETSC_DRAW_BLACK);
232:       }
233:     }
234:     if (rank == size-1 && periodic) {
235:       MPI_Recv(&tmp,1,MPIU_REAL,0,tag2,comm,&status);
236: #if !defined(PETSC_USE_COMPLEX)
237:       PetscDrawLine(draw,xg[n-2],array[j+step*(n-1)],xg[n-1],tmp,PETSC_DRAW_RED);
238: #else
239:       PetscDrawLine(draw,PetscRealPart(xg[n-2]),PetscRealPart(array[j+step*(n-1)]),
240:                       PetscRealPart(xg[n-1]),tmp,PETSC_DRAW_RED);
241: #endif
242:       if (showpoints) {
243:         PetscDrawPoint(draw,PetscRealPart(xg[n-2]),PetscRealPart(array[j+step*(n-1)]),PETSC_DRAW_BLACK);
244:       }
245:     }
246:     PetscDrawSynchronizedFlush(draw);
247:     PetscDrawPause(draw);
248:   }
249:   VecRestoreArray(xcoor,&xg);
250:   VecRestoreArray(xin,&array);
251:   return(0);
252: }