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<h4 class="subsectionHead"><span class="titlemark">3.4 </span> <a
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id="x16-530003.4"></a>Preconditioner data structure</h4>
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<!--l. 1315--><p class="noindent" >Our base library offers support for simple well known preconditioners like Diagonal
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Scaling or Block Jacobi with incomplete factorization ILU(0).
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<!--l. 1319--><p class="indent" > A preconditioner is held in the <a
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id="precdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_prec</span><span
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class="cmtt-10">_type</span></a> data structure reported in
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figure <a
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href="#x16-53001r4">4<!--tex4ht:ref: fig:prectype --></a>. The <span class="lstinline"></span><span
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class="cmtt-10">psb_prec_type</span> data type may contain a simple preconditioning matrix
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with the associated communication descriptor.The internal preconditioner is
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allocated appropriately with the dynamic type corresponding to the desired
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preconditioner.
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<!--l. 1347--><p class="noindent" >
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<div class="minipage"><div class="verbatim" id="verbatim-30">
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 <br />  type psb_Tprec_type
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 <br />    class(psb_T_base_prec_type), allocatable :: prec
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 <br />  end type psb_Tprec_type
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 <br />
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<!--l. 1355--><p class="nopar" ></div></div>
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<br /> <div class="caption"
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><span class="id">Listing 4: </span><span
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class="content">The PSBLAS defined data type that contains a preconditioner.</span></div><!--tex4ht:label?: x16-53001r4 -->
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