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Added entrywise inversion and documentation for vec-vec operation

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<TITLE>psb_get_mpicomm -- Get the MPI communicator</TITLE>
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<TITLE>psb_init -- Initializes PSBLAS parallel environment</TITLE>
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<H2><A NAME="SECTION00084000000000000000">
psb_get_mpicomm -- Get the MPI communicator</A>
<H2><A NAME="SECTION00081000000000000000">
psb_init -- Initializes PSBLAS parallel
environment</A>
</H2>
<P>
<PRE>
call psb_get_mpicomm(icontxt, icomm)
call psb_init(icontxt, np, basectxt, ids)
</PRE>
<P>
This subroutine returns the MPI communicator associated with a PSBLAS context
This subroutine initializes the PSBLAS parallel environment, defining
a virtual parallel machine.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Asynchronous.
<DD>Synchronous.
</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.
<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>.
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer variable.
Specified as: an integer value. Default: use all available processes.
</DD>
<DT><STRONG>basectxt</STRONG></DT>
<DD>the initial communication context. The new context
will be defined from the processes participating in the initial one.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value. Default: use MPI_COMM_WORLD.
</DD>
<DT><STRONG>ids</STRONG></DT>
<DD>Identities of the processes to use for the new context; the
argument is ignored when <code>np</code> is not specified. This allows the
processes in the new environment to be in an order different from the
original one.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer array. Default: use the indices <SPAN CLASS="MATH"><IMG
WIDTH="93" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img102.png"
ALT="$(0\dots np-1)$"></SPAN>.
</DD>
</DL>
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<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>icomm</STRONG></DT>
<DD>The MPI communicator associated with the PSBLAS virtual parallel machine.
<DT><STRONG>icontxt</STRONG></DT>
<DD>the communication context identifying the virtual
parallel machine. Note that this is always a duplicate of
<code>basectxt</code>, so that library communications are completely
separated from other communication operations.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>out</B>.
<BR></DD>
<BR>
Specified as: an integer variable.
</DD>
</DL>
<P>
<BR><HR>
<BIG CLASS="LARGE"><B>Notes</B></BIG>
<OL>
<LI>A call to this routine must precede any other PSBLAS call.
</LI>
<LI>It is an error to specify a value for <SPAN CLASS="MATH"><IMG
WIDTH="21" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img140.png"
ALT="$np$"></SPAN> greater than the
number of processes available in the underlying base parallel
environment.
</LI>
</OL>
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