xref: /petsc/src/dm/tutorials/ex7.c (revision 7a101e5e7ba9859de4c800924a501d6ea3cd325c)
1 static char help[] = "Demonstrates using PetscViewerPushFormat(viewer,PETSC_VIEWER_BINARY_MATLAB)\n\n";
2 
3 #include <petscsys.h>
4 #include <petscdm.h>
5 #include <petscdmda.h>
6 #include <petscbag.h>
7 
8 typedef struct {
9   char      filename[PETSC_MAX_PATH_LEN];
10   PetscReal ra;
11   PetscInt  ia;
12   PetscBool ta;
13 } Parameter;
14 
15 int main(int argc,char **argv)
16 {
17   PetscBag       bag;
18   Parameter      *params;
19   PetscViewer    viewer;
20   DM             da;
21   Vec            global,local;
22   PetscMPIInt    rank;
23 
24   /*
25     Every PETSc routine should begin with the PetscInitialize() routine.
26     argc, argv - These command line arguments are taken to extract the options
27                  supplied to PETSc and options supplied to MPI.
28     help       - When PETSc executable is invoked with the option -help,
29                  it prints the various options that can be applied at
30                  runtime.  The user can use the "help" variable place
31                  additional help messages in this printout.
32   */
33   PetscFunctionBeginUser;
34   PetscCall(PetscInitialize(&argc,&argv,(char*)0,help));
35   /* Create a DMDA and an associated vector */
36   PetscCall(DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE,DMDA_STENCIL_BOX,10,10,PETSC_DECIDE,PETSC_DECIDE,2,1,NULL,NULL,&da));
37   PetscCall(DMSetFromOptions(da));
38   PetscCall(DMSetUp(da));
39   PetscCall(DMCreateGlobalVector(da,&global));
40   PetscCall(DMCreateLocalVector(da,&local));
41   PetscCall(VecSet(global,-1.0));
42   PetscCall(DMGlobalToLocalBegin(da,global,INSERT_VALUES,local));
43   PetscCall(DMGlobalToLocalEnd(da,global,INSERT_VALUES,local));
44   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank));
45   PetscCall(VecScale(local,rank+1));
46   PetscCall(DMLocalToGlobalBegin(da,local,ADD_VALUES,global));
47   PetscCall(DMLocalToGlobalEnd(da,local,ADD_VALUES,global));
48 
49   /* Create an empty bag */
50   PetscCall(PetscBagCreate(PETSC_COMM_WORLD,sizeof(Parameter),&bag));
51   PetscCall(PetscBagGetData(bag,(void**)&params));
52 
53   /* fill bag: register variables, defaults, names, help strings */
54   PetscCall(PetscBagSetName(bag,"ParameterBag","contains problem parameters"));
55   PetscCall(PetscBagRegisterString(bag,&params->filename,PETSC_MAX_PATH_LEN,"output_file","filename","Name of secret file"));
56   PetscCall(PetscBagRegisterReal  (bag,&params->ra,1.0,"param_1","The first parameter"));
57   PetscCall(PetscBagRegisterInt   (bag,&params->ia,5,"param_2","The second parameter"));
58   PetscCall(PetscBagRegisterBool (bag,&params->ta,PETSC_TRUE,"do_output","Write output file (true/false)"));
59 
60   /*
61      Write output file with PETSC_VIEWER_BINARY_MATLAB format
62      NOTE: the output generated with this viewer can be loaded into
63      MATLAB using $PETSC_DIR/share/petsc/matlab/PetscReadBinaryMatlab.m
64   */
65   PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,params->filename,FILE_MODE_WRITE,&viewer));
66   PetscCall(PetscViewerPushFormat(viewer,PETSC_VIEWER_BINARY_MATLAB));
67   PetscCall(PetscBagView(bag,viewer));
68   PetscCall(DMDASetFieldName(da,0,"field1"));
69   PetscCall(DMDASetFieldName(da,1,"field2"));
70   PetscCall(PetscObjectSetName((PetscObject)global,"da1"));
71   PetscCall(VecView(global,viewer));
72   PetscCall(PetscViewerPopFormat(viewer));
73   PetscCall(PetscViewerDestroy(&viewer));
74 
75   /* clean up and exit */
76   PetscCall(PetscBagDestroy(&bag));
77   PetscCall(DMDestroy(&da));
78   PetscCall(VecDestroy(&local));
79   PetscCall(VecDestroy(&global));
80   PetscCall(PetscFinalize());
81   return 0;
82 }
83 
84 /*TEST
85 
86    test:
87 
88 TEST*/
89