BVNormColumn#

Computes the vector norm of a selected column.

Synopsis#

#include "slepcbv.h" 
PetscErrorCode BVNormColumn(BV bv,PetscInt j,NormType type,PetscReal *val)

Collective

Input Parameters#

  • bv - basis vectors

  • j - column number to be used

  • type - the norm type

Output Parameter#

  • val - the norm

Notes#

The norm of V[j] is computed (NORM_1, NORM_2, or NORM_INFINITY). If a non-standard inner product has been specified with BVSetMatrix(), then the returned value is sqrt(V[j]’BV[j]), where B is the inner product matrix (argument ‘type’ is ignored).

See Also#

BVNorm(), BVNormVec(), BVNormalize(), BVSetActiveColumns(), BVSetMatrix()

Level#

intermediate

Location#

src/sys/classes/bv/interface/bvglobal.c

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