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<H2><A NAME="SECTION00044000000000000000"></A>
<A NAME="sec:spmat"></A>
<BR>
Dense Vector Data Structure
</H2>
The vdata<TT>psb_vect_type</TT> data structure
encapsulates the dense vectors in a way similar to sparse matrices. 
The user will not, in general, access the vector components directly,
but rather via the routines of sec.&nbsp;<A HREF="node55.html#sec:toolsrout">6</A>. Among other
simple things, we define here an extraction method that can be used to
get a full copy of the part of the vector stored on the local
process. 

<P>
The type declaration is shown in
figure&nbsp;<A HREF="#fig:vectype">5</A> where <code>T</code> is a placeholder for the
data type and precision variants 
<DL>
<DT><STRONG>I</STRONG></DT>
<DD>Integer;
</DD>
<DT><STRONG>S</STRONG></DT>
<DD>Single precision real;
</DD>
<DT><STRONG>D</STRONG></DT>
<DD>Double precision real;
</DD>
<DT><STRONG>C</STRONG></DT>
<DD>Single precision complex;
</DD>
<DT><STRONG>Z</STRONG></DT>
<DD>Double precision complex.
</DD>
</DL>
The actual data is contained in the polymorphic component <code>a%a</code>; its
specific layout can be chosen dynamically among the predefined types,
or an entirely new storage layout can be implemented and passed to the
library at runtime via the <code>psb_spasb</code> routine. 

<DIV ALIGN="CENTER"><A NAME="fig:vectype"></A><A NAME="708"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5:</STRONG>
    The PSBLAS defined data type that
    contains a dense vector..</CAPTION>
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<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>

<UL>
<LI><A NAME="tex2html561"
  HREF="node30.html">Methods</A>
<LI><A NAME="tex2html562"
  HREF="node31.html">get_nrows -- Get number of  rows in a dense vector</A>
<LI><A NAME="tex2html563"
  HREF="node32.html">get_ncols -- Get number of  columns in a  sparse matrix</A>
<LI><A NAME="tex2html564"
  HREF="node33.html">sizeof  -- Get memory occupation in bytes
of  a dense vector matrix</A>
<LI><A NAME="tex2html565"
  HREF="node34.html">get_vect  -- Get a copy of the vector contents</A>
</UL>
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