xref: /petsc/src/dm/tutorials/ex3.c (revision 732aec7a18f2199fb53bb9a2f3aef439a834ce31)
1 static char help[] = "Tests DMCreateInterpolation() for nonuniform DMDA coordinates.\n\n";
2 
3 #include <petscdm.h>
4 #include <petscdmda.h>
5 
SetCoordinates1d(DM da)6 PetscErrorCode SetCoordinates1d(DM da)
7 {
8   PetscInt     i, start, m;
9   Vec          local, global;
10   PetscScalar *coors, *coorslocal;
11   DM           cda;
12 
13   PetscFunctionBeginUser;
14   PetscCall(DMDASetUniformCoordinates(da, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0));
15   PetscCall(DMGetCoordinateDM(da, &cda));
16   PetscCall(DMGetCoordinates(da, &global));
17   PetscCall(DMGetCoordinatesLocal(da, &local));
18   PetscCall(DMDAVecGetArray(cda, global, &coors));
19   PetscCall(DMDAVecGetArrayRead(cda, local, &coorslocal));
20   PetscCall(DMDAGetCorners(cda, &start, 0, 0, &m, 0, 0));
21   for (i = start; i < start + m; i++) {
22     if (i % 2) coors[i] = coorslocal[i - 1] + .1 * (coorslocal[i + 1] - coorslocal[i - 1]);
23   }
24   PetscCall(DMDAVecRestoreArray(cda, global, &coors));
25   PetscCall(DMDAVecRestoreArrayRead(cda, local, &coorslocal));
26   PetscCall(DMGlobalToLocalBegin(cda, global, INSERT_VALUES, local));
27   PetscCall(DMGlobalToLocalEnd(cda, global, INSERT_VALUES, local));
28   PetscFunctionReturn(PETSC_SUCCESS);
29 }
30 
SetCoordinates2d(DM da)31 PetscErrorCode SetCoordinates2d(DM da)
32 {
33   PetscInt     i, j, mstart, m, nstart, n;
34   Vec          local, global;
35   DMDACoor2d **coors, **coorslocal;
36   DM           cda;
37 
38   PetscFunctionBeginUser;
39   PetscCall(DMDASetUniformCoordinates(da, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0));
40   PetscCall(DMGetCoordinateDM(da, &cda));
41   PetscCall(DMGetCoordinates(da, &global));
42   PetscCall(DMGetCoordinatesLocal(da, &local));
43   PetscCall(DMDAVecGetArray(cda, global, &coors));
44   PetscCall(DMDAVecGetArrayRead(cda, local, &coorslocal));
45   PetscCall(DMDAGetCorners(cda, &mstart, &nstart, 0, &m, &n, 0));
46   for (i = mstart; i < mstart + m; i++) {
47     for (j = nstart; j < nstart + n; j++) {
48       if (i % 2) coors[j][i].x = coorslocal[j][i - 1].x + .1 * (coorslocal[j][i + 1].x - coorslocal[j][i - 1].x);
49       if (j % 2) coors[j][i].y = coorslocal[j - 1][i].y + .3 * (coorslocal[j + 1][i].y - coorslocal[j - 1][i].y);
50     }
51   }
52   PetscCall(DMDAVecRestoreArray(cda, global, &coors));
53   PetscCall(DMDAVecRestoreArrayRead(cda, local, &coorslocal));
54 
55   PetscCall(DMGlobalToLocalBegin(cda, global, INSERT_VALUES, local));
56   PetscCall(DMGlobalToLocalEnd(cda, global, INSERT_VALUES, local));
57   PetscFunctionReturn(PETSC_SUCCESS);
58 }
59 
SetCoordinates3d(DM da)60 PetscErrorCode SetCoordinates3d(DM da)
61 {
62   PetscInt      i, j, mstart, m, nstart, n, pstart, p, k;
63   Vec           local, global;
64   DMDACoor3d ***coors, ***coorslocal;
65   DM            cda;
66 
67   PetscFunctionBeginUser;
68   PetscCall(DMDASetUniformCoordinates(da, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0));
69   PetscCall(DMGetCoordinateDM(da, &cda));
70   PetscCall(DMGetCoordinates(da, &global));
71   PetscCall(DMGetCoordinatesLocal(da, &local));
72   PetscCall(DMDAVecGetArray(cda, global, &coors));
73   PetscCall(DMDAVecGetArrayRead(cda, local, &coorslocal));
74   PetscCall(DMDAGetCorners(cda, &mstart, &nstart, &pstart, &m, &n, &p));
75   for (i = mstart; i < mstart + m; i++) {
76     for (j = nstart; j < nstart + n; j++) {
77       for (k = pstart; k < pstart + p; k++) {
78         if (i % 2) coors[k][j][i].x = coorslocal[k][j][i - 1].x + .1 * (coorslocal[k][j][i + 1].x - coorslocal[k][j][i - 1].x);
79         if (j % 2) coors[k][j][i].y = coorslocal[k][j - 1][i].y + .3 * (coorslocal[k][j + 1][i].y - coorslocal[k][j - 1][i].y);
80         if (k % 2) coors[k][j][i].z = coorslocal[k - 1][j][i].z + .4 * (coorslocal[k + 1][j][i].z - coorslocal[k - 1][j][i].z);
81       }
82     }
83   }
84   PetscCall(DMDAVecRestoreArray(cda, global, &coors));
85   PetscCall(DMDAVecRestoreArrayRead(cda, local, &coorslocal));
86   PetscCall(DMGlobalToLocalBegin(cda, global, INSERT_VALUES, local));
87   PetscCall(DMGlobalToLocalEnd(cda, global, INSERT_VALUES, local));
88   PetscFunctionReturn(PETSC_SUCCESS);
89 }
90 
main(int argc,char ** argv)91 int main(int argc, char **argv)
92 {
93   PetscInt        M = 5, N = 4, P = 3, m = PETSC_DECIDE, n = PETSC_DECIDE, p = PETSC_DECIDE, dim = 1;
94   DM              dac, daf;
95   DMBoundaryType  bx = DM_BOUNDARY_NONE, by = DM_BOUNDARY_NONE, bz = DM_BOUNDARY_NONE;
96   DMDAStencilType stype = DMDA_STENCIL_BOX;
97   Mat             A;
98 
99   PetscFunctionBeginUser;
100   PetscCall(PetscInitialize(&argc, &argv, NULL, help));
101   PetscCall(PetscOptionsGetInt(NULL, NULL, "-M", &M, NULL));
102   PetscCall(PetscOptionsGetInt(NULL, NULL, "-N", &N, NULL));
103   PetscCall(PetscOptionsGetInt(NULL, NULL, "-P", &P, NULL));
104   PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));
105   PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL));
106   PetscCall(PetscOptionsGetInt(NULL, NULL, "-p", &p, NULL));
107   PetscCall(PetscOptionsGetInt(NULL, NULL, "-dim", &dim, NULL));
108 
109   /* Create distributed array and get vectors */
110   if (dim == 1) {
111     PetscCall(DMDACreate1d(PETSC_COMM_WORLD, bx, M, 1, 1, NULL, &dac));
112   } else if (dim == 2) {
113     PetscCall(DMDACreate2d(PETSC_COMM_WORLD, bx, by, stype, M, N, PETSC_DECIDE, PETSC_DECIDE, 1, 1, NULL, NULL, &dac));
114   } else if (dim == 3) {
115     PetscCall(DMDACreate3d(PETSC_COMM_WORLD, bx, by, bz, stype, M, N, P, PETSC_DECIDE, PETSC_DECIDE, PETSC_DECIDE, 1, 1, NULL, NULL, NULL, &dac));
116   } else SETERRQ(PETSC_COMM_WORLD, PETSC_ERR_SUP, "dim must be 1,2, or 3");
117   PetscCall(DMSetFromOptions(dac));
118   PetscCall(DMSetUp(dac));
119 
120   PetscCall(DMRefine(dac, PETSC_COMM_WORLD, &daf));
121 
122   PetscCall(DMDASetUniformCoordinates(dac, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0));
123   if (dim == 1) {
124     PetscCall(SetCoordinates1d(daf));
125   } else if (dim == 2) {
126     PetscCall(SetCoordinates2d(daf));
127   } else if (dim == 3) {
128     PetscCall(SetCoordinates3d(daf));
129   }
130   PetscCall(DMCreateInterpolation(dac, daf, &A, 0));
131 
132   /* Free memory */
133   PetscCall(DMDestroy(&dac));
134   PetscCall(DMDestroy(&daf));
135   PetscCall(MatDestroy(&A));
136   PetscCall(PetscFinalize());
137   return 0;
138 }
139 
140 /*TEST
141 
142    test:
143       nsize: 3
144       args: -mat_view
145 
146    test:
147       suffix: 2
148       nsize: 3
149       args: -mat_view -dim 2
150 
151    test:
152       suffix: 3
153       nsize: 3
154       args: -mat_view -dim 3
155 
156 TEST*/
157