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<H1><A NAME="SECTION00040000000000000000"></A>
<A NAME="sec:datastruct"></A>
<BR>
Data Structures and Classes
</H1>

<P>
In this chapter we  illustrate the  data structures used for definition of
routines interfaces. They  include data structures for sparse matrices,
communication descriptors and preconditioners.
<P>
All the data types and the basic subroutine interfaces related to
descriptors and sparse matrices are defined in
the module <code>psb_base_mod</code>; this will have to be included by every
user subroutine that makes use of the library. The preconditioners are
defined in the module <code>psb_prec_mod</code>

<P>
Integer, real and complex data types are parametrized with a kind type
defined in the library as follows: 
<DL>
<DT><STRONG>psb_spk_</STRONG></DT>
<DD>Kind parameter for short precision real and complex
  data; corresponds to a <code>REAL</code> declaration and is
  normally 4 bytes; 
</DD>
<DT><STRONG>psb_dpk_</STRONG></DT>
<DD>Kind parameter for long precision real and complex
  data; corresponds to a <code>DOUBLE PRECISION</code> declaration and is
  normally 8 bytes;
</DD>
<DT><STRONG>psb_ipk_</STRONG></DT>
<DD>Kind parameter for integer data;
  with default build options this is a 4 bytes integer, but there is
  (highly) experimental support for 8-bytes integers;  
</DD>
<DT><STRONG>psb_mpik_</STRONG></DT>
<DD>Kind parameter for 4-bytes integer data, as is
  always used by MPI; 
</DD>
<DT><STRONG>psb_long_int_k_</STRONG></DT>
<DD>Kind parameter for long (8 bytes) integers, 
  which are always used by the <code>sizeof</code> methods.
</DD>
</DL>
Together with the classes attributes we also discuss their
methods.  Most methods detailed here only act on the local variable,
i.e. their action is purely local and asynchronous unless otherwise
stated. 
The list of methods here is not completely exhaustive; many methods,
especially those that alter the contents of the various objects, are
usually not needed by the end-user, and therefore are described in the
developer's documentation. 

<P>
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>

<UL>
<LI><A NAME="tex2html270"
  HREF="node9.html">Descriptor data structure</A>
<UL>
<LI><A NAME="tex2html271"
  HREF="node10.html">Methods</A>
<LI><A NAME="tex2html272"
  HREF="node11.html">get_local_rows -- Get number of local rows</A>
<LI><A NAME="tex2html273"
  HREF="node12.html">get_local_cols -- Get number of local cols</A>
<LI><A NAME="tex2html274"
  HREF="node13.html">get_global_rows -- Get number of global rows</A>
<LI><A NAME="tex2html275"
  HREF="node14.html">get_global_cols -- Get number of global cols</A>
</UL>
<BR>
<LI><A NAME="tex2html276"
  HREF="node15.html">
<DIV ALIGN="LEFT">
get_context--Get communication context 
</DIV></A>
<UL>
<LI><A NAME="tex2html277"
  HREF="node16.html">psb_cd_get_large_threshold -- Get threshold for
  index mapping switch</A>
<LI><A NAME="tex2html278"
  HREF="node17.html">psb_cd_set_large_threshold -- Set threshold for
  index mapping switch</A>
<LI><A NAME="tex2html279"
  HREF="node18.html">Named Constants</A>
</UL>
<BR>
<LI><A NAME="tex2html280"
  HREF="node19.html">Sparse Matrix class</A>
<UL>
<LI><A NAME="tex2html281"
  HREF="node20.html">Methods</A>
<LI><A NAME="tex2html282"
  HREF="node21.html">get_nrows -- Get number of  rows in a sparse  matrix</A>
<LI><A NAME="tex2html283"
  HREF="node22.html">get_ncols -- Get number of  columns in a  sparse matrix</A>
<LI><A NAME="tex2html284"
  HREF="node23.html">get_nnzeros -- Get number of nonzero elements
  in a sparse matrix</A>
<LI><A NAME="tex2html285"
  HREF="node24.html">get_size  -- Get maximum number of nonzero elements
  in a sparse matrix</A>
<LI><A NAME="tex2html286"
  HREF="node25.html">sizeof  -- Get memory occupation in bytes
of  a sparse matrix</A>
<LI><A NAME="tex2html287"
  HREF="node26.html">get_fmt  -- Short description of the dynamic type</A>
<LI><A NAME="tex2html288"
  HREF="node27.html">is_bld, is_upd, is_asb  -- Status check</A>
<LI><A NAME="tex2html289"
  HREF="node28.html">Named Constants</A>
</UL>
<BR>
<LI><A NAME="tex2html290"
  HREF="node29.html">Dense Vector Data Structure</A>
<UL>
<LI><A NAME="tex2html291"
  HREF="node30.html">Methods</A>
<LI><A NAME="tex2html292"
  HREF="node31.html">get_nrows -- Get number of  rows in a dense vector</A>
<LI><A NAME="tex2html293"
  HREF="node32.html">get_ncols -- Get number of  columns in a  sparse matrix</A>
<LI><A NAME="tex2html294"
  HREF="node33.html">sizeof  -- Get memory occupation in bytes
of  a dense vector matrix</A>
<LI><A NAME="tex2html295"
  HREF="node34.html">get_vect  -- Get a copy of the vector contents</A>
</UL>
<BR>
<LI><A NAME="tex2html296"
  HREF="node35.html">Preconditioner data structure</A>
</UL>
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