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# BVNormVecBegin

Starts a split phase norm computation.

## Synopsis

    #include "slepcbv.h"
    PetscErrorCode BVNormVecBegin(BV bv,Vec v,NormType type,PetscReal *val)

## Input Parameters

- bv - basis vectors

- v - the vector

- type - the norm type

- val - the norm

## Note

Each call to `BVNormVecBegin()` should be paired with a call to `BVNormVecEnd()`.

## See Also

BV: Basis Vectors, `BVNormVecEnd()`, `BVNormVec()`

## Level

advanced

## Location

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

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