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Added entrywise inversion and documentation for vec-vec operation

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<!--Converted with LaTeX2HTML 2018 (Released Feb 1, 2018) -->
<HTML>
<HEAD>
<TITLE>psb_snd -- Send data</TITLE>
<META NAME="description" CONTENT="psb_snd -- Send data">
<TITLE>psb_amx -- Global maximum absolute value</TITLE>
<META NAME="description" CONTENT="psb_amx -- Global maximum absolute value">
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<H2><A NAME="SECTION000816000000000000000">
psb_snd -- Send data</A>
<H2><A NAME="SECTION000813000000000000000">
psb_amx -- Global maximum absolute value</A>
</H2>
<P>
<PRE>
call psb_snd(icontxt, dat, dst, m)
call psb_amx(icontxt, dat, root)
</PRE>
<P>
This subroutine sends a packet of data to a destination.
This subroutine implements a maximum absolute value reduction
operation based on the underlying communication library.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Synchronous: see usage notes.
<DD>Synchronous.
</DD>
<DT><STRONG><B>On Entry </B></STRONG></DT>
<DD>
@@ -79,65 +80,38 @@ Intent: <B>in</B>.
Specified as: an integer variable.
</DD>
<DT><STRONG>dat</STRONG></DT>
<DD>The data to be sent.
<DD>The local contribution to the global maximum.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
Intent: <B>inout</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="13" ALIGN="BOTTOM" BORDER="0"
SRC="img145.png"
ALT="$m$"></SPAN> is
not specified, size must agree as well.
scalar, or a rank 1 or 2 array. Type, kind, rank and size must agree on all processes.
</DD>
<DT><STRONG>dst</STRONG></DT>
<DD>Destination process.
<DT><STRONG>root</STRONG></DT>
<DD>Process to hold the final value, or <SPAN CLASS="MATH"><IMG
WIDTH="24" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img88.png"
ALT="$-1$"></SPAN> to make it available
on all processes.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>required</B>.
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value <!-- MATH
$0<= dst <= np-1$
$-1<= root <= np-1$
-->
<SPAN CLASS="MATH"><IMG
WIDTH="146" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img146.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="32" ALIGN="MIDDLE" BORDER="0"
WIDTH="165" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img147.png"
ALT="$0&lt;= m &lt;= size(dat,1)$"></SPAN>.
<BR>
When <SPAN CLASS="MATH"><IMG
WIDTH="26" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img143.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="83" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img148.png"
ALT="$size(dat,1)$"></SPAN>; must have the
same value on sending and receiving processes.
</DD>
ALT="$-1&lt;= root &lt;= np-1$"></SPAN>, default -1.
<BR></DD>
</DL>
<P>
@@ -145,17 +119,29 @@ same value on sending and receiving processes.
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>dat</STRONG></DT>
<DD>On destination process(es), the result of the maximum operation.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>inout</B>.
<BR>
Specified as: an integer, real or complex variable, which may be a
scalar, or a rank 1 or 2 array. Type, kind, rank and size must agree on all processes.
</DD>
</DL>
<P>
<BIG CLASS="LARGE"><B>Notes</B></BIG>
<OL>
<LI>This subroutine implies a synchronization, but only between the
calling process and the destination process <SPAN CLASS="MATH"><IMG
WIDTH="25" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img149.png"
ALT="$dst$"></SPAN>.
<LI>The <code>dat</code> argument is both input and output, and its
value may be changed even on processes different from the final
result destination.
</LI>
<LI>The <code>dat</code> argument may also be a long integer scalar.
</LI>
</OL>
@@ -163,26 +149,26 @@ same value on sending and receiving processes.
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