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)

Logically Collective

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