1: #include <petsc/private/tsimpl.h>

  3: static PetscErrorCode OutputBIN(MPI_Comm comm, const char *filename, PetscViewer *viewer)
  4: {
  5:   PetscFunctionBegin;
  6:   PetscCall(PetscViewerCreate(comm, viewer));
  7:   PetscCall(PetscViewerSetType(*viewer, PETSCVIEWERBINARY));
  8:   PetscCall(PetscViewerFileSetMode(*viewer, FILE_MODE_WRITE));
  9:   PetscCall(PetscViewerFileSetName(*viewer, filename));
 10:   PetscFunctionReturn(PETSC_SUCCESS);
 11: }

 13: static PetscErrorCode TSTrajectorySet_Visualization(TSTrajectory tj, TS ts, PetscInt stepnum, PetscReal time, Vec X)
 14: {
 15:   PetscViewer viewer;
 16:   char        filename[PETSC_MAX_PATH_LEN];
 17:   PetscReal   tprev;
 18:   MPI_Comm    comm;

 20:   PetscFunctionBegin;
 21:   PetscCall(PetscObjectGetComm((PetscObject)ts, &comm));
 22:   if (stepnum == 0) {
 23:     PetscMPIInt rank;
 24:     PetscCallMPI(MPI_Comm_rank(comm, &rank));
 25:     if (rank == 0) {
 26:       PetscCall(PetscRMTree("Visualization-data"));
 27:       PetscCall(PetscMkdir("Visualization-data"));
 28:     }
 29:     if (tj->names) {
 30:       PetscViewer bnames;
 31:       PetscCall(PetscViewerBinaryOpen(comm, "Visualization-data/variablenames", FILE_MODE_WRITE, &bnames));
 32:       PetscCall(PetscViewerBinaryWriteStringArray(bnames, (const char *const *)tj->names));
 33:       PetscCall(PetscViewerDestroy(&bnames));
 34:     }
 35:     PetscCall(PetscSNPrintf(filename, sizeof(filename), "Visualization-data/SA-%06" PetscInt_FMT ".bin", stepnum));
 36:     PetscCall(OutputBIN(comm, filename, &viewer));
 37:     if (!tj->transform) {
 38:       PetscCall(VecView(X, viewer));
 39:     } else {
 40:       Vec XX;
 41:       PetscCall((*tj->transform)(tj->transformctx, X, &XX));
 42:       PetscCall(VecView(XX, viewer));
 43:       PetscCall(VecDestroy(&XX));
 44:     }
 45:     PetscCall(PetscViewerBinaryWrite(viewer, &time, 1, PETSC_REAL));
 46:     PetscCall(PetscViewerDestroy(&viewer));
 47:     PetscFunctionReturn(PETSC_SUCCESS);
 48:   }
 49:   PetscCall(PetscSNPrintf(filename, sizeof(filename), "Visualization-data/SA-%06" PetscInt_FMT ".bin", stepnum));
 50:   PetscCall(OutputBIN(comm, filename, &viewer));
 51:   if (!tj->transform) {
 52:     PetscCall(VecView(X, viewer));
 53:   } else {
 54:     Vec XX;
 55:     PetscCall((*tj->transform)(tj->transformctx, X, &XX));
 56:     PetscCall(VecView(XX, viewer));
 57:     PetscCall(VecDestroy(&XX));
 58:   }
 59:   PetscCall(PetscViewerBinaryWrite(viewer, &time, 1, PETSC_REAL));

 61:   PetscCall(TSGetPrevTime(ts, &tprev));
 62:   PetscCall(PetscViewerBinaryWrite(viewer, &tprev, 1, PETSC_REAL));

 64:   PetscCall(PetscViewerDestroy(&viewer));
 65:   PetscFunctionReturn(PETSC_SUCCESS);
 66: }

 68: /*MC
 69:       TSTRAJECTORYVISUALIZATION - Stores each solution of the ODE/DAE in a file

 71:       Saves each timestep into a separate file in Visualization-data/SA-%06d.bin

 73:       This version saves only the solutions at each timestep, it does not save the solution at each stage,
 74:       see `TSTRAJECTORYBASIC` that saves all stages

 76:       $PETSC_DIR/share/petsc/matlab/PetscReadBinaryTrajectory.m and $PETSC_DIR/lib/petsc/bin/PetscBinaryIOTrajectory.py
 77:       can read in files created with this format into MATLAB and Python.

 79:   Level: intermediate

 81: .seealso: [](ch_ts), `TSTrajectoryCreate()`, `TS`, `TSTrajectorySetType()`, `TSTrajectoryType`, `TSTrajectorySetVariableNames()`,
 82:           `TSTrajectoryType`, `TSTrajectory`
 83: M*/
 84: PETSC_EXTERN PetscErrorCode TSTrajectoryCreate_Visualization(TSTrajectory tj, TS ts)
 85: {
 86:   PetscFunctionBegin;
 87:   tj->ops->set    = TSTrajectorySet_Visualization;
 88:   tj->setupcalled = PETSC_TRUE;
 89:   PetscFunctionReturn(PETSC_SUCCESS);
 90: }