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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
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<TITLE>VecNormBegin</TITLE>
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<A NAME="VecNormBegin"><H1>VecNormBegin</H1></A>
Starts a split phase norm computation.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscvec.h"
PetscErrorCode PETSCVEC_DLLEXPORT VecNormBegin(Vec x,NormType ntype,PetscReal *result)
</PRE>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x </B></TD><TD>- the first vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ntype </B></TD><TD>- norm type, one of <A HREF="../Vec/NORM_1.html#NORM_1">NORM_1</A>, <A HREF="../Vec/NORM_2.html#NORM_2">NORM_2</A>, <A HREF="../Vec/NORM_MAX.html#NORM_MAX">NORM_MAX</A>, <A HREF="../Vec/NORM_1_AND_2.html#NORM_1_AND_2">NORM_1_AND_2</A>
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>result </B></TD><TD>- where the result will go (can be <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A>)
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">C++ variants</FONT></H3><TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD>  VecNormBegin(Vec x)<TD WIDTH=20></TD><TD>-></TD><TD WIDTH=20></TD><TD>VecNormBegin(x,NORM_2,PETSC_NULL)</TR></TD>
<TR><TD WIDTH=40></TD><TD>  VecNormBegin(Vec x,NormType t)<TD WIDTH=20></TD><TD>-></TD><TD WIDTH=20></TD><TD>VecNormBegin(x,t,PETSC_NULL)</TR></TD>
</TABLE>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Each call to <A HREF="../Vec/VecNormBegin.html#VecNormBegin">VecNormBegin</A>() should be paired with a call to <A HREF="../Vec/VecNormEnd.html#VecNormEnd">VecNormEnd</A>().
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Vec/VecNormEnd.html#VecNormEnd">VecNormEnd</A>(), <A HREF="../Vec/VecNorm.html#VecNorm">VecNorm</A>(), <A HREF="../Vec/VecDot.html#VecDot">VecDot</A>(), <A HREF="../Vec/VecMDot.html#VecMDot">VecMDot</A>(), <A HREF="../Vec/VecDotBegin.html#VecDotBegin">VecDotBegin</A>(), <A HREF="../Vec/VecDotEnd.html#VecDotEnd">VecDotEnd</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/vec/vec/utils/comb.c.html#VecNormBegin">src/vec/vec/utils/comb.c</A>
<BR><A HREF="./index.html">Index of all Vec routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/vec/vec/examples/tutorials/ex17.c.html">src/vec/vec/examples/tutorials/ex17.c.html</A><BR>
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