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<H1><A NAME="SECTION000850000000000000000">
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psb_precbld -- Builds a preconditioner</A>
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</H1>
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<P>
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ifstarssyntaxsyntaxcall psb_precblda, desc_a, prec, info
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<P>
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous.
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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>a</STRONG></DT>
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<DD>the system sparse matrix.
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>in</B>, target.
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<BR>
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Specified as: a sparse matrix data structure spdata<TT>psb_spmat_type</TT>.
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</DD>
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<DT><STRONG>prec</STRONG></DT>
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<DD>the preconditioner.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>inout</B>.
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<BR>
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Specified as: an already initialized precondtioner data structure precdata<TT>psb_prec_type</TT>
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<BR></DD>
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<DT><STRONG>desc_a</STRONG></DT>
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<DD>the problem communication descriptor.
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>in</B>, target.
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<BR>
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Specified as: a communication descriptor data structure descdata<TT>psb_desc_type</TT>.
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</DD>
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</DL>
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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>prec</STRONG></DT>
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<DD>the preconditioner.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>inout</B>.
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<BR>
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Specified as: a precondtioner data structure precdata<TT>psb_prec_type</TT>
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<BR></DD>
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<DT><STRONG>info</STRONG></DT>
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<DD>Error code.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>out</B>.
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<BR>
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An integer value; 0 means no error has been detected.
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</DD>
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</DL>
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