VecISAXPY#

Adds a reduced vector to the appropriate elements of a full-space vector. vfull[is[i]] += alpha*vreduced[i]

Synopsis#

#include "petscvec.h"  
PetscErrorCode VecISAXPY(Vec vfull, IS is, PetscScalar alpha, Vec vreduced)

Input Parameters#

  • vfull - the full-space vector

  • is - the index set for the reduced space

  • alpha - the scalar coefficient

  • vreduced - the reduced-space vector

Output Parameter#

  • vfull - the sum of the full-space vector and reduced-space vector

Notes#

The index set identifies entries in the global vector. Negative indices are skipped; indices outside the ownership range of vfull will raise an error.

See Also#

VecISCopy(), VecISSet(), VecAXPY()

Level#

advanced

Location#

src/vec/vec/utils/projection.c

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Index of all Vec routines
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Index of all manual pages