Actual source code: relative.c
petsc-3.10.5 2019-03-28
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      2:  #include <petsc/private/vecimpl.h>
      3: #include "../src/vec/vec/utils/tagger/impls/simple.h"

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

     14:   VecTaggerGetBlockSize(tagger,&bs);
     15:   *numBoxes = 1;
     16:   PetscMalloc1(bs,&bxs);
     17:   VecGetLocalSize(vec,&n);
     18:   n /= bs;
     19:   for (i = 0; i < bs; i++) {
     20: #if !defined(PETSC_USE_COMPLEX)
     21:     bxs[i].min = PETSC_MAX_REAL;
     22:     bxs[i].max = PETSC_MIN_REAL;
     23: #else
     24:     bxs[i].min = PetscCMPLX(PETSC_MAX_REAL,PETSC_MAX_REAL);
     25:     bxs[i].max = PetscCMPLX(PETSC_MIN_REAL,PETSC_MIN_REAL);
     26: #endif
     27:   }
     28:   VecGetArrayRead(vec, &vArray);
     29:   for (i = 0, k = 0; i < n; i++) {
     30:     for (j = 0; j < bs; j++, k++) {
     31: #if !defined(PETSC_USE_COMPLEX)
     32:       bxs[j].min = PetscMin(bxs[j].min,vArray[k]);
     33:       bxs[j].max = PetscMax(bxs[j].max,vArray[k]);
     34: #else
     35:       bxs[j].min = PetscCMPLX(PetscMin(PetscRealPart(bxs[j].min),PetscRealPart(vArray[k])),PetscMin(PetscImaginaryPart(bxs[j].min),PetscImaginaryPart(vArray[k])));
     36:       bxs[j].max = PetscCMPLX(PetscMax(PetscRealPart(bxs[j].max),PetscRealPart(vArray[k])),PetscMax(PetscImaginaryPart(bxs[j].max),PetscImaginaryPart(vArray[k])));
     37: #endif
     38:     }
     39:   }
     40:   for (i = 0; i < bs; i++) bxs[i].max = -bxs[i].max;
     41:   VecRestoreArrayRead(vec, &vArray);
     42:   MPI_Allreduce(MPI_IN_PLACE,(PetscReal *) bxs,2*(sizeof(PetscScalar)/sizeof(PetscReal))*bs,MPIU_REAL,MPIU_MIN,PetscObjectComm((PetscObject)tagger));
     43:   for (i = 0; i < bs; i++) {
     44:     PetscScalar mins = bxs[i].min;
     45:     PetscScalar difs = -bxs[i].max - mins;
     46: #if !defined(PETSC_USE_COMPLEX)
     47:     bxs[i].min = mins + smpl->box[i].min * difs;
     48:     bxs[i].max = mins + smpl->box[i].max * difs;
     49: #else
     50:     bxs[i].min = mins + PetscCMPLX(PetscRealPart(smpl->box[i].min)*PetscRealPart(difs),PetscImaginaryPart(smpl->box[i].min)*PetscImaginaryPart(difs));
     51:     bxs[i].max = mins + PetscCMPLX(PetscRealPart(smpl->box[i].max)*PetscRealPart(difs),PetscImaginaryPart(smpl->box[i].max)*PetscImaginaryPart(difs));
     52: #endif
     53:   }
     54:   *boxes = bxs;
     55:   return(0);
     56: }

     58: /*@C
     59:   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.

     61:   Logically Collective

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

     67:   Level: advanced

     69: .seealso: VecTaggerRelativeGetBox()
     70: @*/
     71: PetscErrorCode VecTaggerRelativeSetBox(VecTagger tagger,VecTaggerBox *box)
     72: {

     76:   VecTaggerSetBox_Simple(tagger,box);
     77:   return(0);
     78: }

     80: /*@C
     81:   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.

     83:   Logically Collective

     85:   Input Arguments:
     86: . tagger - the VecTagger context

     88:   Output Arguments:
     89: . box - a blocksize list of VecTaggerBox boxes

     91:   Level: advanced

     93: .seealso: VecTaggerRelativeSetBox()
     94: @*/
     95: PetscErrorCode VecTaggerRelativeGetBox(VecTagger tagger,const VecTaggerBox **box)
     96: {

    100:   VecTaggerGetBox_Simple(tagger,box);
    101:   return(0);
    102: }

    104: PETSC_INTERN PetscErrorCode VecTaggerCreate_Relative(VecTagger tagger)
    105: {
    106:   PetscErrorCode     ierr;

    109:   VecTaggerCreate_Simple(tagger);
    110:   tagger->ops->computeboxes = VecTaggerComputeBoxes_Relative;
    111:   return(0);
    112: }