1: #include <petsc/private/vecimpl.h>
  2: #include "../src/vec/vec/utils/tagger/impls/simple.h"

  4: static PetscErrorCode VecTaggerComputeBoxes_Relative(VecTagger tagger, Vec vec, PetscInt *numBoxes, VecTaggerBox **boxes, PetscBool *listed)
  5: {
  6:   VecTagger_Simple  *smpl = (VecTagger_Simple *)tagger->data;
  7:   PetscInt           bs, i, j, k, n;
  8:   VecTaggerBox      *bxs;
  9:   const PetscScalar *vArray;

 11:   PetscFunctionBegin;
 12:   PetscCall(VecTaggerGetBlockSize(tagger, &bs));
 13:   *numBoxes = 1;
 14:   PetscCall(PetscMalloc1(bs, &bxs));
 15:   PetscCall(VecGetLocalSize(vec, &n));
 16:   n /= bs;
 17:   for (i = 0; i < bs; i++) {
 18: #if !defined(PETSC_USE_COMPLEX)
 19:     bxs[i].min = PETSC_MAX_REAL;
 20:     bxs[i].max = PETSC_MIN_REAL;
 21: #else
 22:     bxs[i].min = PetscCMPLX(PETSC_MAX_REAL, PETSC_MAX_REAL);
 23:     bxs[i].max = PetscCMPLX(PETSC_MIN_REAL, PETSC_MIN_REAL);
 24: #endif
 25:   }
 26:   PetscCall(VecGetArrayRead(vec, &vArray));
 27:   for (i = 0, k = 0; i < n; i++) {
 28:     for (j = 0; j < bs; j++, k++) {
 29: #if !defined(PETSC_USE_COMPLEX)
 30:       bxs[j].min = PetscMin(bxs[j].min, vArray[k]);
 31:       bxs[j].max = PetscMax(bxs[j].max, vArray[k]);
 32: #else
 33:       bxs[j].min = PetscCMPLX(PetscMin(PetscRealPart(bxs[j].min), PetscRealPart(vArray[k])), PetscMin(PetscImaginaryPart(bxs[j].min), PetscImaginaryPart(vArray[k])));
 34:       bxs[j].max = PetscCMPLX(PetscMax(PetscRealPart(bxs[j].max), PetscRealPart(vArray[k])), PetscMax(PetscImaginaryPart(bxs[j].max), PetscImaginaryPart(vArray[k])));
 35: #endif
 36:     }
 37:   }
 38:   for (i = 0; i < bs; i++) bxs[i].max = -bxs[i].max;
 39:   PetscCall(VecRestoreArrayRead(vec, &vArray));
 40:   PetscCall(MPIU_Allreduce(MPI_IN_PLACE, (PetscReal *)bxs, 2 * (sizeof(PetscScalar) / sizeof(PetscReal)) * bs, MPIU_REAL, MPIU_MIN, PetscObjectComm((PetscObject)tagger)));
 41:   for (i = 0; i < bs; i++) {
 42:     PetscScalar mins = bxs[i].min;
 43:     PetscScalar difs = -bxs[i].max - mins;
 44: #if !defined(PETSC_USE_COMPLEX)
 45:     bxs[i].min = mins + smpl->box[i].min * difs;
 46:     bxs[i].max = mins + smpl->box[i].max * difs;
 47: #else
 48:     bxs[i].min = mins + PetscCMPLX(PetscRealPart(smpl->box[i].min) * PetscRealPart(difs), PetscImaginaryPart(smpl->box[i].min) * PetscImaginaryPart(difs));
 49:     bxs[i].max = mins + PetscCMPLX(PetscRealPart(smpl->box[i].max) * PetscRealPart(difs), PetscImaginaryPart(smpl->box[i].max) * PetscImaginaryPart(difs));
 50: #endif
 51:   }
 52:   *boxes = bxs;
 53:   if (listed) *listed = PETSC_TRUE;
 54:   PetscFunctionReturn(PETSC_SUCCESS);
 55: }

 57: /*@C
 58:   VecTaggerRelativeSetBox - Set the relative box defining the values to be tagged by the tagger, where relative boxes are subsets of [0,1] (or [0,1]+[0,1]i for complex scalars), where 0 indicates the smallest value present in the vector and 1 indicates the largest.

 60:   Logically Collective

 62:   Input Parameters:
 63: + tagger - the VecTagger context
 64: - box    - a blocksize list of VecTaggerBox boxes

 66:   Level: advanced

 68: .seealso: `VecTaggerRelativeGetBox()`
 69: @*/
 70: PetscErrorCode VecTaggerRelativeSetBox(VecTagger tagger, VecTaggerBox box[])
 71: {
 72:   PetscFunctionBegin;
 73:   PetscCall(VecTaggerSetBox_Simple(tagger, box));
 74:   PetscFunctionReturn(PETSC_SUCCESS);
 75: }

 77: /*@C
 78:   VecTaggerRelativeGetBox - Get the relative box defining the values to be tagged by the tagger, where relative boxess are subsets of [0,1] (or [0,1]+[0,1]i for complex scalars), where 0 indicates the smallest value present in the vector and 1 indicates the largest.

 80:   Logically Collective

 82:   Input Parameter:
 83: . tagger - the VecTagger context

 85:   Output Parameter:
 86: . box - a blocksize list of VecTaggerBox boxes

 88:   Level: advanced

 90: .seealso: `VecTaggerRelativeSetBox()`
 91: @*/
 92: PetscErrorCode VecTaggerRelativeGetBox(VecTagger tagger, const VecTaggerBox *box[])
 93: {
 94:   PetscFunctionBegin;
 95:   PetscCall(VecTaggerGetBox_Simple(tagger, box));
 96:   PetscFunctionReturn(PETSC_SUCCESS);
 97: }

 99: PETSC_INTERN PetscErrorCode VecTaggerCreate_Relative(VecTagger tagger)
100: {
101:   PetscFunctionBegin;
102:   PetscCall(VecTaggerCreate_Simple(tagger));
103:   tagger->ops->computeboxes = VecTaggerComputeBoxes_Relative;
104:   PetscFunctionReturn(PETSC_SUCCESS);
105: }