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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<H2><A NAME="SECTION00088000000000000000"></A><A NAME="sec:precdescr"></A>
<H1><A NAME="SECTION00090000000000000000"></A><A NAME="sec:adding"></A>
<BR>
Subroutine descr
</H2>
Adding smoothers and solvers to MLD2P4
</H1>
<P>
<B>Da ampliare e completare - SALVATORE.</B>
<BR>
<P>
Completely new smoother and/or solver classes derived from the
base objects in the library may be used without recompiling the
library itself. Once the new smoother/solver class has been
developed, the user can declare a variable of that new type in the
application, and pass that variable to the <code>p%set(solver,info)</code>
call; the new solver object is then dynamically included in the
preconditioner structure.
<P>
<BR>
<P>
If the user has developed a new type of smoother and/or
solver by extending one of the base MLD2P4 types, and has declared a
variable of the new type in the main program, it is possible to pass
the new smoother/solver variable to the setup routine as follows:
<DIV ALIGN="CENTER">
<code>call p%descr(info, [iout])</code>
<BR>
<code>call p%set(smoother,info [,ilev, ilmax,pos])</code>
<BR><code>call p%set(solver,info [,ilev, ilmax,pos])</code>
</DIV>
In this way, the variable will act as a <I>mold</I> to which the
preconditioner will conform, even though the MLD2P4 library is not
modified, and thus has no direct knowledge about the new type.
<P>
This routine prints a description of the preconditioner <code>p</code> to the standard output or
to a file. It must be called after <code>hierachy_bld</code> and <code>smoothers_bld</code>,
or <code>bld</code>, have been called.
<P>
<FONT SIZE="+1"><B>Arguments</B></FONT>
<P></P>
<BR>
<P>
<TABLE CELLPADDING=3>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>info</code></TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>integer, intent(out)</code>.</TD>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>smoother</code></TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>class(mld_x_base_smoother_type)</code></TD>
</TR>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34>&nbsp;</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>Error code. If no error, 0 is returned. See Section&nbsp;<A HREF="node26.html#sec:errors">8</A> for details.</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>The user-defined new smoother to be employed in the
preconditioner.</TD>
</TR>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>iout</code></TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>integer, intent(in), optional</code>.</TD>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>solver</code></TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>class(mld_x_base_solver_type)</code></TD>
</TR>
<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34>&nbsp;</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>The id of the file where the preconditioner description
will be printed; the default is the standard output.</TD>
<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>The user-defined new solver to be employed in the
preconditioner.</TD>
</TR>
</TABLE>
<P>
For compatibility with the previous versions of MLD2P4, this routine can be also invoked
as follows:
<P>
<DIV ALIGN="CENTER">
<code>call mld_precdescr(p,info [,iout])</code>
</DIV>
<P>
<P>
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