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194 lines
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<H2><A NAME="SECTION00072000000000000000">
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psb_cdins -- Communication descriptor insert routine</A>
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</H2>
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<P>
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<PRE>
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call psb_cdins(nz, ia, ja, desc_a, info)
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</PRE>
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<P>
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This subroutine examines the edges of the graph associated with the
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discretization mesh (and isomorphic to the sparsity pattern of a
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linear system coefficient matrix), storing them as necessary into the
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communication descriptor.
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<P>
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Asynchronous.
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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>nz</STRONG></DT>
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<DD>the number of points being inserted.
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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: an integer value.
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</DD>
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<DT><STRONG>ia</STRONG></DT>
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<DD>the indices of the starting vertex of the edges being inserted.
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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: an integer array of length <IMG
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WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img99.png"
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ALT="$nz$">.
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</DD>
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<DT><STRONG>ja</STRONG></DT>
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<DD>the indices of the end vertex of the edges being inserted.
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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: an integer array of length <IMG
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WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img99.png"
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ALT="$nz$">.
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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>desc_a</STRONG></DT>
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<DD>the updated 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>inout</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>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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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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<LI>This routine may only be called if the descriptor is in the
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build state;
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</LI>
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<LI>This routine automatically ignores edges that do not
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insist on the current process, i.e. edges for which neither the starting
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nor the end vertex belong to the current process.
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</LI>
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