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198 lines
5.3 KiB
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<H2><A NAME="SECTION00079000000000000000">
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psb_spasb -- Sparse matrix assembly routine</A>
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</H2>
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<P>
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<PRE>
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call psb_spasb(a, desc_a, info, afmt, upd, dupl)
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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>desc_a</STRONG></DT>
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<DD>the communication descriptor.
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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>in</B>.
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<BR>
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Specified as: a structured data of type descdata<TT>psb_desc_type</TT>.
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</DD>
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<DT><STRONG>afmt</STRONG></DT>
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<DD>the storage format for the sparse matrix.
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<BR>
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Scope: <B>global</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>in</B>.
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<BR>
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Specified as: an array of characters. Defalt: 'CSR'.
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</DD>
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<DT><STRONG>upd</STRONG></DT>
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<DD>Provide for updates to the matrix coefficients.
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<BR>
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Scope: <B>global</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>in</B>.
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<BR>
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Specified as: integer, possible values: <code>psb_upd_srch_</code>, <code>psb_upd_perm_</code>
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</DD>
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<DT><STRONG>dupl</STRONG></DT>
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<DD>How to handle duplicate coefficients.
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<BR>
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Scope: <B>global</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>in</B>.
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<BR>
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Specified as: integer, possible values: <code>psb_dupl_ovwrt_</code>,
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<code>psb_dupl_add_</code>, <code>psb_dupl_err_</code>.
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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>a</STRONG></DT>
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<DD>the matrix to be assembled.
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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 structured data of type spdata<TT>psb_spmat_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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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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<LI>On entry to this routine the descriptor must be in the
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assembled state, i.e. <code>psb_cdasb</code> must already have been called.
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</LI>
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<LI>The sparse matrix may be in either the build or update state;
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</LI>
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<LI>Duplicate entries are detected and handled in both build and
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update state, with the exception of the error action that is only
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taken in the build state, i.e. on the first assembly;
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</LI>
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<LI>If the update choice is <code>psb_upd_perm_</code>, then subsequent
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calls to <code>psb_spins</code> to update the matrix must be arranged in
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such a way as to produce exactly the same sequence of coefficient
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values as encountered at the first assembly;
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</LI>
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<LI>On exit from this routine the matrix is in the assembled state,
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and thus is suitable for the computational routines.
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</LI>
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</OL>
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<P>
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