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<A NAME="VecStrideMin"><H1>VecStrideMin</H1></A>
Computes the minimum of subvector of a vector defined by a starting point and a stride and optionally its location.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscvec.h"
int VecStrideMin(Vec v,int start,int *idex,PetscReal *nrm)
</PRE>
Collective on <A HREF="../Vec/Vec.html#Vec">Vec</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>v </B></TD><TD>- the vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>start </B></TD><TD>- starting point of the subvector (defined by a stride)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>idex </B></TD><TD>- the location where the minimum occurred (not supported, pass <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A>,
if you need this, send mail to petsc-maint@mcs.anl.gov to request it)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nrm </B></TD><TD>- the min
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
One must call <A HREF="../Vec/VecSetBlockSize.html#VecSetBlockSize">VecSetBlockSize</A>() before this routine to set the stride
information, or use a vector created from a multicomponent <A HREF="../DA/DA.html#DA">DA</A>.
<P>
If xa is the array representing the vector x, then this computes the min
of the array (xa[start],xa[start+stride],xa[start+2*stride], ....)
<P>
This is useful for computing, say the minimum of the pressure variable when
the pressure is stored (interlaced) with other variables, e.g., density, etc.
This will only work if the desire subvector is a stride subvector.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Vec/VecMin.html#VecMin">VecMin</A>(), <A HREF="../Vec/VecStrideNorm.html#VecStrideNorm">VecStrideNorm</A>(), <A HREF="../Vec/VecStrideGather.html#VecStrideGather">VecStrideGather</A>(), <A HREF="../Vec/VecStrideScatter.html#VecStrideScatter">VecStrideScatter</A>(), <A HREF="../Vec/VecStrideMax.html#VecStrideMax">VecStrideMax</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/vec/utils/vinv.c.html#VecStrideMin">src/vec/utils/vinv.c</A>
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