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original version by: Nikos Drakos, CBLU, University of Leeds
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* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
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* with significant contributions from:
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<TITLE>User Interface</TITLE>
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HREF="node19.html">Subroutine init</A>
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<!--End of Navigation Panel-->
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<H1><A NAME="SECTION00080000000000000000"></A><A NAME="sec:userinterface"></A>
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<BR>
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User Interface
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</H1><FONT SIZE="+1"><FONT SIZE="+1"></FONT></FONT>
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<P>
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<FONT SIZE="+1"><FONT SIZE="+1"><FONT SIZE="+1">The basic user interface of MLD2P4 consists of eight routines. The six
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routines <code>init</code>, <code>set</code>,
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<code>hierarchy_build</code>, <code>smoothers_build</code>,
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<code>bld</code>, and <code>apply</code> encapsulate all the
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functionalities for the setup and the application of any multilevel and one-level
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preconditioner implemented in the package.
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The routine <code>free</code> deallocates the preconditioner data structure, while
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<code>descr</code> prints a description of the preconditioner setup by the user.
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</FONT></FONT></FONT>
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<P>
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<FONT SIZE="+1"><FONT SIZE="+1"><FONT SIZE="+1">All the routines are available as methods of the preconditioner object.
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For each routine, the same user interface is overloaded with
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respect to the real/ complex case and the single/double precision;
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arguments with appropriate data types must be passed to the routine,
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i.e.,
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</FONT></FONT></FONT>
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<UL>
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<LI>the sparse matrix data structure, containing the matrix to be
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preconditioned, must be of type <code>psb_</code><I>x</I><code>spmat_type</code>
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with <I>x</I> = <code>s</code> for real single precision, <I>x</I> = <code>d</code>
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for real double precision, <I>x</I> = <code>c</code> for complex single precision,
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<I>x</I> = <code>z</code> for complex double precision;
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</LI>
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<LI>the preconditioner data structure must be of type
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<code>mld_</code><I>x</I><code>prec_type</code>, with <I>x</I> =
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<code>s</code>, <code>d</code>, <code>c</code>, <code>z</code>, according to the sparse
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matrix data structure;
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</LI>
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<LI>the arrays containing the vectors <IMG
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WIDTH="14" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
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SRC="img72.png"
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ALT="$v$"> and <IMG
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WIDTH="17" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
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SRC="img73.png"
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ALT="$w$"> involved in
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the preconditioner application <IMG
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WIDTH="82" HEIGHT="21" ALIGN="BOTTOM" BORDER="0"
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SRC="img23.png"
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ALT="$w=B^{-1}v$"> must be of type
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<code>psb_</code><I>x</I><code>vect_type</code> with <I>x</I> =
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<code>s</code>, <code>d</code>, <code>c</code>, <code>z</code>, in a manner completely
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analogous to the sparse matrix type;
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</LI>
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<LI>real parameters defining the preconditioner must be declared
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according to the precision of the sparse matrix and preconditioner
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data structures (see Section <A HREF="node20.html#sec:precset">6.2</A>).
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</LI>
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</UL><FONT SIZE="+1"><FONT SIZE="+1"><FONT SIZE="+1">
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A description of each routine is given in the remainder of this section.
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</FONT></FONT></FONT>
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<P>
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<FONT SIZE="+1"><FONT SIZE="+1"></FONT></FONT>
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<P>
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<FONT SIZE="+1"><FONT SIZE="+1"></FONT></FONT>
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<BR><HR>
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<!--Table of Child-Links-->
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<UL>
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<LI><A NAME="tex2html301"
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HREF="node19.html">Subroutine init</A>
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<LI><A NAME="tex2html302"
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HREF="node20.html">Subroutine set</A>
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<LI><A NAME="tex2html303"
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HREF="node21.html">Subroutine build</A>
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<LI><A NAME="tex2html304"
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HREF="node22.html">Subroutine hierarchy_build</A>
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<LI><A NAME="tex2html305"
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HREF="node23.html">Subroutine smoothers_build</A>
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<LI><A NAME="tex2html306"
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HREF="node24.html">Subroutine apply</A>
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<LI><A NAME="tex2html307"
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HREF="node25.html">Subroutine free</A>
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<LI><A NAME="tex2html308"
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HREF="node26.html">Subroutine descr</A>
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</UL>
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<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A>
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<BR>
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<B> Next:</B> <A NAME="tex2html300"
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HREF="node19.html">Subroutine init</A>
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<B> Up:</B> <A NAME="tex2html296"
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HREF="userhtml.html">userhtml</A>
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<B> Previous:</B> <A NAME="tex2html290"
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HREF="node17.html">Examples</A>
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<B> <A NAME="tex2html298"
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HREF="node2.html">Contents</A></B>
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