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<H2><A NAME="SECTION00044000000000000000"></A>
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<A NAME="sec:prec"></A>
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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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<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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<DIV ALIGN="CENTER"><A NAME="fig:prectype"></A><A NAME="886"></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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<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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