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<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>
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="13" ALIGN="BOTTOM" BORDER="0"
 SRC="img145.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="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"
 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>
</DL>

<P>
<DL>
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</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>
</OL>

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