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159 lines
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<H2><A NAME="SECTION00044000000000000000"></A>
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<A NAME="sec:spmat"></A>
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<BR>
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Dense Vector Data Structure
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</H2>
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The vdata<TT>psb_vect_type</TT> data structure
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encapsulates the dense vectors in a way similar to sparse matrices.
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The user will not, in general, access the vector components directly,
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but rather via the routines of sec. <A HREF="node55.html#sec:toolsrout">6</A>. Among other
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simple things, we define here an extraction method that can be used to
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get a full copy of the part of the vector stored on the local
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process.
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<P>
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The type declaration is shown in
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figure <A HREF="#fig:vectype">5</A> where <code>T</code> is a placeholder for the
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data type and precision variants
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<DL>
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<DT><STRONG>I</STRONG></DT>
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<DD>Integer;
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</DD>
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<DT><STRONG>S</STRONG></DT>
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<DD>Single precision real;
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</DD>
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<DT><STRONG>D</STRONG></DT>
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<DD>Double precision real;
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</DD>
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<DT><STRONG>C</STRONG></DT>
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<DD>Single precision complex;
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</DD>
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<DT><STRONG>Z</STRONG></DT>
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<DD>Double precision complex.
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</DD>
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</DL>
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The actual data is contained in the polymorphic component <code>a%a</code>; its
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specific layout can be chosen dynamically among the predefined types,
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or an entirely new storage layout can be implemented and passed to the
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library at runtime via the <code>psb_spasb</code> routine.
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<DIV ALIGN="CENTER"><A NAME="fig:vectype"></A><A NAME="708"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5:</STRONG>
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The PSBLAS defined data type that
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contains a dense vector..</CAPTION>
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<TR><TD>
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<BR>
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<!-- MATH
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<P>
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<BR><HR>
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<!--Table of Child-Links-->
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<UL>
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<LI><A NAME="tex2html561"
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HREF="node30.html">Methods</A>
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<LI><A NAME="tex2html562"
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HREF="node31.html">get_nrows -- Get number of rows in a dense vector</A>
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<LI><A NAME="tex2html563"
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HREF="node32.html">get_ncols -- Get number of columns in a sparse matrix</A>
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<LI><A NAME="tex2html564"
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HREF="node33.html">sizeof -- Get memory occupation in bytes
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of a dense vector matrix</A>
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<LI><A NAME="tex2html565"
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HREF="node34.html">get_vect -- Get a copy of the vector contents</A>
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