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Salvatore Filippone
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<HEAD>
<TITLE>Preconditioner data structure</TITLE>
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<TITLE>clone -- Clone current object</TITLE>
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<H2><A NAME="SECTION00044000000000000000"></A>
<A NAME="sec:prec"></A>
<BR>
Preconditioner data structure
</H2>
Our base library offers support for simple well known preconditioners
like Diagonal Scaling or Block Jacobi with incomplete
factorization ILU(0).
<H3><A NAME="SECTION00043500000000000000">
clone -- Clone current object</A>
</H3>
<PRE>
call x%clone(y,info)
</PRE>
<P>
A preconditioner is held in the precdata<TT> psb_prec_type</TT> data structure reported in
figure&nbsp;<A HREF="#fig:prectype">6</A>. The <code>psb_prec_type</code>
data type may contain a simple preconditioning matrix with the
associated communication descriptor.The internal preconditioner is allocated appropriately with the
dynamic type corresponding to the desired preconditioner.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Asynchronous.
</DD>
<DT><STRONG><B>On Entry</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>x</STRONG></DT>
<DD>the dense vector.
<BR>
Scope: <B>local</B>.
<BR></DD>
</DL>
<DIV ALIGN="CENTER"><A NAME="fig:prectype"></A><A NAME="855"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6:</STRONG>
The PSBLAS defined data type that contains a preconditioner.</CAPTION>
<TR><TD><FONT SIZE="-1"> </FONT>
<DIV ALIGN="CENTER"></DIV><TABLE WIDTH="90%">
<TR><TD>
<PRE>
type psb_Tprec_type
class(psb_T_base_prec_type), allocatable :: prec
end type psb_Tprec_type
</PRE></TD></TR>
</TABLE>
<DIV ALIGN="CENTER"></DIV></TD></TR>
</TABLE>
</DIV>
<P>
<DL>
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>y</STRONG></DT>
<DD>A copy of the input object.
</DD>
<DT><STRONG>info</STRONG></DT>
<DD>Return code.
</DD>
</DL>
<P>
<BR><HR>