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Document DESC%CNV method and MOLD arguments to CDASB and PREC%BUILD
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Salvatore Filippone
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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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<!--Converted with LaTeX2HTML 2017.2 (Released Jan 23, 2017) -->
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<HTML>
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<HEAD>
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<TITLE>Preconditioner data structure</TITLE>
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<META NAME="description" CONTENT="Preconditioner data structure">
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<TITLE>clone -- Clone current object</TITLE>
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HREF="node48.html">get_vect Get</A>
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<BR>
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<H2><A NAME="SECTION00044000000000000000"></A>
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<A NAME="sec:prec"></A>
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<BR>
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Preconditioner data structure
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</H2>
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Our base library offers support for simple well known preconditioners
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like Diagonal Scaling or Block Jacobi with incomplete
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factorization ILU(0).
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<H3><A NAME="SECTION00043600000000000000">
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clone -- Clone current object</A>
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</H3>
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<PRE>
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call x%clone(y,info)
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</PRE>
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<P>
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A preconditioner is held in the precdata<TT> psb_prec_type</TT> data structure reported in
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figure <A HREF="#fig:prectype">6</A>. The <code>psb_prec_type</code>
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data type may contain a simple preconditioning matrix with the
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associated communication descriptor.The internal preconditioner is allocated appropriately with the
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dynamic type corresponding to the desired preconditioner.
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Asynchronous.
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</DD>
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<DT><STRONG><B>On Entry</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>x</STRONG></DT>
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<DD>the dense vector.
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<BR>
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Scope: <B>local</B>.
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<BR></DD>
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</DL>
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<DIV ALIGN="CENTER"><A NAME="fig:prectype"></A><A NAME="925"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6:</STRONG>
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The PSBLAS defined data type that contains a preconditioner.</CAPTION>
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<TR><TD><FONT SIZE="-1">
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</FONT>
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<DIV ALIGN="CENTER"></DIV><TABLE WIDTH="90%">
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<TR><TD>
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<PRE>
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type psb_Tprec_type
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class(psb_T_base_prec_type), allocatable :: prec
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end type psb_Tprec_type
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</PRE></TD></TR>
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</TABLE>
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<DIV ALIGN="CENTER"></DIV></TD></TR>
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</TABLE>
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</DIV>
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<P>
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<DL>
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<DT><STRONG><B>On Return</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>y</STRONG></DT>
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<DD>A copy of the input object.
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</DD>
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<DT><STRONG>info</STRONG></DT>
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<DD>Return code.
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</DD>
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</DL>
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<P>
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<BR><HR>
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