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154 lines
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HREF="node9.html">Descriptor data structure</A>
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<H1><A NAME="SECTION00040000000000000000"></A>
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<A NAME="sec:datastruct"></A>
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<BR>
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Data Structures
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</H1>
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<P>
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In this chapter we illustrate the data structures used for definition of
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routines interfaces. They include data structures for sparse matrices,
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communication descriptors and preconditioners.
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<P>
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All the data types and the basic subroutine interfaces are defined in
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the module <code>psb_base_mod</code>; this will have to be included by every
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user subroutine that makes use of the library.
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<P>
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Real and complex data types are parametrized with a kind type defined
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in the library as follows:
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<DL>
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<DT><STRONG>psb_spk_</STRONG></DT>
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<DD>Kind parameter for short precision real and complex
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data; corresponds to a <code>REAL</code> declaration and is
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normally 4 bytes.
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</DD>
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<DT><STRONG>psb_dpk_</STRONG></DT>
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<DD>Kind parameter for long precision real and complex
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data; corresponds to a <code>DOUBLE PRECISION</code> declaration and is
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normally 8 bytes.
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</DD>
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</DL>
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Moreover, the library defines a long integer kind
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<code>psb_long_int_k_</code> which normally corresponds to 64-bit integers;
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it is only used for the <code>psb_sizeof</code> utility.
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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="tex2html255"
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HREF="node9.html">Descriptor data structure</A>
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<UL>
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<LI><A NAME="tex2html256"
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HREF="node10.html">Named Constants</A>
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</UL>
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<BR>
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<LI><A NAME="tex2html257"
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HREF="node11.html">Sparse Matrix data structure</A>
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<UL>
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<LI><A NAME="tex2html258"
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HREF="node12.html">Named Constants</A>
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</UL>
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<BR>
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<LI><A NAME="tex2html259"
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HREF="node13.html">Preconditioner data structure</A>
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<LI><A NAME="tex2html260"
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HREF="node14.html">Data structure query routines</A>
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<UL>
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<LI><A NAME="tex2html261"
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HREF="node15.html">psb_cd_get_local_rows -- Get number of local rows</A>
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<LI><A NAME="tex2html262"
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HREF="node16.html">psb_cd_get_local_cols -- Get number of local cols</A>
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<LI><A NAME="tex2html263"
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HREF="node17.html">psb_cd_get_global_rows -- Get number of global rows</A>
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<LI><A NAME="tex2html264"
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HREF="node18.html">psb_cd_get_global_cols -- Get number of global cols</A>
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</UL>
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<BR>
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<LI><A NAME="tex2html265"
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HREF="node19.html">
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<DIV ALIGN="LEFT">
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psb_cd_get_context--Get communication context
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</DIV></A>
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<UL>
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<LI><A NAME="tex2html266"
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HREF="node20.html">psb_cd_get_large_threshold -- Get threshold for
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index mapping switch</A>
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<LI><A NAME="tex2html267"
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HREF="node21.html">psb_cd_set_large_threshold -- Set threshold for
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index mapping switch</A>
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<LI><A NAME="tex2html268"
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HREF="node22.html">psb_sp_get_nrows -- Get number of rows in a sparse
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matrix</A>
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<LI><A NAME="tex2html269"
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HREF="node23.html">psb_sp_get_ncols -- Get number of columns in a
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sparse matrix</A>
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<LI><A NAME="tex2html270"
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HREF="node24.html">psb_sp_get_nnzeros -- Get number of nonzero elements
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in a sparse matrix</A>
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</UL></UL>
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