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Added entrywise inversion and documentation for vec-vec operation

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2019-11-21 13:56:22 +01:00
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<!--Converted with LaTeX2HTML 2018 (Released Feb 1, 2018) -->
<HTML>
<HEAD>
<TITLE>psb_get_rank -- Get the MPI rank</TITLE>
<META NAME="description" CONTENT="psb_get_rank -- Get the MPI rank">
<TITLE>psb_info -- Return information about PSBLAS parallel environment</TITLE>
<META NAME="description" CONTENT="psb_info -- Return information about PSBLAS parallel environment">
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<H2><A NAME="SECTION00085000000000000000">
psb_get_rank -- Get the MPI rank</A>
<H2><A NAME="SECTION00082000000000000000">
psb_info -- Return information about PSBLAS parallel
environment</A>
</H2>
<P>
<PRE>
call psb_get_rank(rank, icontxt, id)
call psb_info(icontxt, iam, np)
</PRE>
<P>
This subroutine returns the MPI rank of the PSBLAS process <SPAN CLASS="MATH"><IMG
WIDTH="18" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img138.png"
ALT="$id$"></SPAN>
This subroutine returns information about the PSBLAS parallel environment, defining
a virtual parallel machine.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Asynchronous.
@@ -81,22 +80,6 @@ Intent: <B>in</B>.
<BR>
Specified as: an integer variable.
</DD>
<DT><STRONG>id</STRONG></DT>
<DD>Identifier of a process in the PSBLAS virtual parallel machine.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value. <!-- MATH
$0 \le id \le np-1$
-->
<SPAN CLASS="MATH"><IMG
WIDTH="113" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img139.png"
ALT="$0 \le id \le np-1$"></SPAN> </DD>
</DL>
<P>
@@ -104,20 +87,58 @@ Specified as: an integer value. <!-- MATH
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>rank</STRONG></DT>
<DD>The MPI rank associated with the PSBLAS process <SPAN CLASS="MATH"><IMG
WIDTH="18" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img138.png"
ALT="$id$"></SPAN>.
<DT><STRONG>iam</STRONG></DT>
<DD>Identifier of current process in the PSBLAS virtual parallel machine.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>out</B>.
<BR></DD>
<BR>
Specified as: an integer value. <!-- MATH
$-1 \le iam \le np-1$
-->
<SPAN CLASS="MATH"><IMG
WIDTH="139" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img141.png"
ALT="$-1 \le iam \le np-1$"></SPAN> </DD>
<DT><STRONG>np</STRONG></DT>
<DD>Number of processes in the PSBLAS virtual parallel machine.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>out</B>.
<BR>
Specified as: an integer variable. </DD>
</DL>
<P>
<BIG CLASS="LARGE"><B>Notes</B></BIG>
<OL>
<LI>For processes in the virtual parallel machine the identifier
will satisfy <!-- MATH
$0 \le iam \le np-1$
-->
<SPAN CLASS="MATH"><IMG
WIDTH="127" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img142.png"
ALT="$0 \le iam \le np-1$"></SPAN>;
</LI>
<LI>If the user has requested on <code>psb_init</code> a number of
processes less than the total available in the parallel execution
environment, the remaining processes will have on return <SPAN CLASS="MATH"><IMG
WIDTH="73" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img143.png"
ALT="$iam=-1$"></SPAN>;
the only call involving <code>icontxt</code> that any such process may
execute is to <code>psb_exit</code>.
</LI>
</OL>
<P>
<BR><HR>