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157 lines
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157 lines
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<H2><A NAME="SECTION000113000000000000000">
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psb_precaply -- Preconditioner application
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routine</A>
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</H2>
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<P>
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<PRE>
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call psb_precaply(prec,x,y,desc_a,info,trans,work)
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call psb_precaply(prec,x,desc_a,info,trans)
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</PRE>
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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>prec</STRONG></DT>
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<DD>the preconditioner.
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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>.
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<BR>
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Specified as: a preconditioner data structure precdata<TT>psb_prec_type</TT>.
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</DD>
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<DT><STRONG>x</STRONG></DT>
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<DD>the source vector.
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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 rank one array or an object of type vdata<TT>psb_T_vect_type</TT>.
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</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>.
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<BR>
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Specified as: a communication data structure descdata<TT>psb_desc_type</TT>.
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</DD>
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<DT><STRONG>trans</STRONG></DT>
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<DD>Scope:
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<BR>
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Type: <B>optional</B>
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: a character.
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</DD>
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<DT><STRONG>work</STRONG></DT>
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<DD>an optional work space
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Scope: <B>local</B>
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<BR>
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Type: <B>optional</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 double precision array.
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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>y</STRONG></DT>
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<DD>the destination vector.
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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 rank one array or an object of type vdata<TT>psb_T_vect_type</TT>.
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</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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<P>
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