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Added entrywise inversion and documentation for vec-vec operation

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<TITLE>Utilities</TITLE>
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<TITLE>psb_snd -- Send data</TITLE>
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<H1><A NAME="SECTION000100000000000000000"></A>
<A NAME="sec:util"></A>
<H2><A NAME="SECTION000816000000000000000">
psb_snd -- Send data</A>
</H2>
<P>
<PRE>
call psb_snd(icontxt, dat, dst, m)
</PRE>
<P>
This subroutine sends a packet of data to a destination.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Synchronous: see usage notes.
</DD>
<DT><STRONG><B>On Entry </B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>icontxt</STRONG></DT>
<DD>the communication context identifying the virtual
parallel machine.
<BR>
Utilities
</H1>
Scope: <B>global</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer variable.
</DD>
<DT><STRONG>dat</STRONG></DT>
<DD>The data to be sent.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer, real or complex variable, which may be a
scalar, or a rank 1 or 2 array, or a character or logical scalar. Type, kind and rank must agree on sender and receiver process; if <SPAN CLASS="MATH"><IMG
WIDTH="18" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img151.png"
ALT="$m$"></SPAN> is
not specified, size must agree as well.
</DD>
<DT><STRONG>dst</STRONG></DT>
<DD>Destination process.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value <!-- MATH
$0<= dst <= np-1$
-->
<SPAN CLASS="MATH"><IMG
WIDTH="145" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img152.png"
ALT="$0&lt;= dst &lt;= np-1$"></SPAN>.
<BR></DD>
<DT><STRONG>m</STRONG></DT>
<DD>Number of rows.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>Optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value <!-- MATH
$0<= m <= size(dat,1)$
-->
<SPAN CLASS="MATH"><IMG
WIDTH="171" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img153.png"
ALT="$0&lt;= m &lt;= size(dat,1)$"></SPAN>.
<BR>
When <SPAN CLASS="MATH"><IMG
WIDTH="26" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img149.png"
ALT="$dat$"></SPAN> is a rank 2 array, specifies the number of rows to be sent
independently of the leading dimension <SPAN CLASS="MATH"><IMG
WIDTH="82" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img154.png"
ALT="$size(dat,1)$"></SPAN>; must have the
same value on sending and receiving processes.
</DD>
</DL>
<P>
We have some utilities available for input and output of
sparse matrices; the interfaces to these routines are available in the
module <code>psb_util_mod</code>.
<DL>
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
</DL>
<P>
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<BIG CLASS="LARGE"><B>Notes</B></BIG>
<UL CLASS="ChildLinks">
<LI><A NAME="tex2html1733"
HREF="node119.html">hb_read -- Read a sparse matrix from a file in the
Harwell-Boeing format</A>
<LI><A NAME="tex2html1734"
HREF="node120.html">hb_write -- Write a sparse matrix to a file
in the Harwell-Boeing format</A>
<LI><A NAME="tex2html1735"
HREF="node121.html">mm_mat_read -- Read a sparse matrix from a
file in the MatrixMarket format</A>
<LI><A NAME="tex2html1736"
HREF="node122.html">mm_array_read -- Read a dense array from a
file in the MatrixMarket format</A>
<LI><A NAME="tex2html1737"
HREF="node123.html">mm_mat_write -- Write a sparse matrix to a
file in the MatrixMarket format</A>
<LI><A NAME="tex2html1738"
HREF="node124.html">mm_array_write -- Write a dense array from a
file in the MatrixMarket format</A>
</UL>
<!--End of Table of Child-Links-->
<BR><HR>
<OL>
<LI>This subroutine implies a synchronization, but only between the
calling process and the destination process <SPAN CLASS="MATH"><IMG
WIDTH="25" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img155.png"
ALT="$dst$"></SPAN>.
</LI>
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