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<TITLE>Iterative Methods</TITLE>
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<TITLE>descr -- Prints a description of current preconditioner</TITLE>
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<H1><A NAME="SECTION000120000000000000000"></A>
<A NAME="sec:methods"></A>
<H2><A NAME="SECTION000114000000000000000">
descr -- Prints a description of current
preconditioner</A>
</H2>
<P>
<PRE>
call prec%descr()
call prec%descr(iout, root)
</PRE>
<P>
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Asynchronous.
</DD>
<DT><STRONG><B>On Entry</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>prec</STRONG></DT>
<DD>the preconditioner.
Scope: <B>local</B>
<BR>
Iterative Methods
</H1>
Type: <B>required</B>
<BR>
Intent: <B>in</B>.
<BR>
Specified as: a preconditioner data structure precdata<TT>psb_prec_type</TT>.
</DD>
<DT><STRONG>iout</STRONG></DT>
<DD>output unit.
Scope: <B>local</B>
<BR>
Type: <B>optional</B>
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer number. Default: default output unit.
</DD>
<DT><STRONG>root</STRONG></DT>
<DD>Process from which to print
Scope: <B>local</B>
<BR>
Type: <B>optional</B>
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer number between 0 and <SPAN CLASS="MATH"><IMG
WIDTH="49" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img167.png"
ALT="$np-1$"></SPAN>, in which case
the specified process will print the description, or <SPAN CLASS="MATH"><IMG
WIDTH="24" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img82.png"
ALT="$-1$"></SPAN>, in which case
all processes will print. Default: 0.
</DD>
</DL>
<P>
In this chapter we provide routines for preconditioners and iterative
methods. The interfaces for Krylov subspace methods are available in
the module <code>psb_krylov_mod</code>.
<P>
<BR><HR>
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<LI><A NAME="tex2html1909"
HREF="node133.html">psb_krylov -- Krylov Methods Driver
Routine</A>
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