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170 lines
4.4 KiB
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170 lines
4.4 KiB
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<H2><A NAME="SECTION00077000000000000000">
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psb_spall -- Allocates a sparse matrix</A>
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</H2>
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<P>
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<PRE>
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call psb_spall(a, desc_a, info, nnz)
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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>nnz</STRONG></DT>
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<DD>An estimate of the number of nonzeroes in the local
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part of the assembled 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 integer value.
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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 allocated.
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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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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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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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<LI>On exit from this routine the sparse matrix is in the build
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state.
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</LI>
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<LI>The descriptor may be in either the build or assembled state.
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</LI>
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<LI>Providing a good estimate for the number of nonzeroes <IMG
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WIDTH="32" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img101.png"
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ALT="$nnz$"> in
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the assembled matrix may substantially improve performance in the
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matrix build phase, as it will reduce or eliminate the need for
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(potentially multiple) data reallocations.
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</LI>
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</OL>
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