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<B> Next:</B> <A NAME="tex2html300"
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HREF="node10.html">Descriptor data structure</A>
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HREF="userhtml.html">userhtml</A>
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HREF="node8.html">Programming model</A>
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<B> <A NAME="tex2html298"
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HREF="node1.html">Contents</A></B>
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<BR></DIV>
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<!--End of Navigation Panel-->
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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 and Classes
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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 related to
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descriptors and sparse matrices 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. The preconditioners are
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defined in the module <code>psb_prec_mod</code>
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<P>
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Integer, real and complex data types are parametrized with a kind type
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defined 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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<DT><STRONG>psb_mpk_</STRONG></DT>
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<DD>Kind parameter for 4-bytes integer data, as is
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always used by MPI;
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</DD>
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<DT><STRONG>psb_epk_</STRONG></DT>
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<DD>Kind parameter for 8-bytes integer data, as is
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always used by the <code>sizeof</code> methods;
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</DD>
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<DT><STRONG>psb_ipk_</STRONG></DT>
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<DD>Kind parameter for “local” integer indices and data;
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with default build options this is a 4 bytes integer;
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</DD>
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<DT><STRONG>psb_lpk_</STRONG></DT>
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<DD>Kind parameter for “global” integer indices and data;
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with default build options this is an 8 bytes integer;
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</DD>
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</DL>
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The integer kinds for local and global indices can be chosen at
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configure time to hold 4 or 8 bytes, with the global indices at least
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as large as the local ones.
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Together with the classes attributes we also discuss their
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methods. Most methods detailed here only act on the local variable,
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i.e. their action is purely local and asynchronous unless otherwise
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stated.
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The list of methods here is not completely exhaustive; many methods,
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especially those that alter the contents of the various objects, are
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usually not needed by the end-user, and therefore are described in the
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developer's documentation.
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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 CLASS="ChildLinks">
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<LI><A NAME="tex2html301"
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HREF="node10.html">Descriptor data structure</A>
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<UL>
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<LI><A NAME="tex2html302"
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HREF="node11.html">Descriptor Methods</A>
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<LI><A NAME="tex2html303"
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HREF="node12.html">get_local_rows -- Get number of local rows</A>
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<LI><A NAME="tex2html304"
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HREF="node13.html">get_local_cols -- Get number of local cols</A>
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<LI><A NAME="tex2html305"
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HREF="node14.html">get_global_rows -- Get number of global rows</A>
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<LI><A NAME="tex2html306"
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HREF="node15.html">get_global_cols -- Get number of global cols</A>
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<LI><A NAME="tex2html307"
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HREF="node16.html">get_global_indices -- Get vector of global indices</A>
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<LI><A NAME="tex2html308"
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HREF="node17.html">get_context -- Get communication context</A>
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<LI><A NAME="tex2html309"
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HREF="node18.html">Clone -- clone current object</A>
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<LI><A NAME="tex2html310"
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HREF="node19.html">CNV -- convert internal storage format</A>
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<LI><A NAME="tex2html311"
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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="tex2html312"
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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="tex2html313"
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HREF="node22.html">Named Constants</A>
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</UL>
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<BR>
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<LI><A NAME="tex2html314"
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HREF="node23.html">Sparse Matrix class</A>
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<UL>
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<LI><A NAME="tex2html315"
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HREF="node24.html">Sparse Matrix Methods</A>
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<LI><A NAME="tex2html316"
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HREF="node25.html">get_nrows -- Get number of rows in a sparse matrix</A>
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<LI><A NAME="tex2html317"
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HREF="node26.html">get_ncols -- Get number of columns in a sparse
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matrix</A>
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<LI><A NAME="tex2html318"
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HREF="node27.html">get_nnzeros -- Get number of nonzero elements
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in a sparse matrix</A>
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<LI><A NAME="tex2html319"
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HREF="node28.html">get_size -- Get maximum number of nonzero elements
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in a sparse matrix</A>
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<LI><A NAME="tex2html320"
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HREF="node29.html">sizeof -- Get memory occupation in bytes
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of a sparse matrix</A>
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<LI><A NAME="tex2html321"
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HREF="node30.html">get_fmt -- Short description of the dynamic type</A>
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<LI><A NAME="tex2html322"
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HREF="node31.html">is_bld, is_upd, is_asb -- Status check</A>
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<LI><A NAME="tex2html323"
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HREF="node32.html">is_lower, is_upper, is_triangle, is_unit --
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Format check</A>
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<LI><A NAME="tex2html324"
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HREF="node33.html">cscnv -- Convert to a different storage format</A>
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<LI><A NAME="tex2html325"
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HREF="node34.html">csclip -- Reduce to a submatrix</A>
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<LI><A NAME="tex2html326"
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HREF="node35.html">clean_zeros -- Eliminate zero coefficients</A>
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<LI><A NAME="tex2html327"
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HREF="node36.html">get_diag -- Get main diagonal</A>
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<LI><A NAME="tex2html328"
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HREF="node37.html">clip_diag -- Cut out main diagonal</A>
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<LI><A NAME="tex2html329"
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HREF="node38.html">tril -- Return the lower triangle</A>
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<LI><A NAME="tex2html330"
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HREF="node39.html">triu -- Return the upper triangle</A>
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<LI><A NAME="tex2html331"
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HREF="node40.html">psb_set_mat_default -- Set default storage format</A>
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<LI><A NAME="tex2html332"
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HREF="node41.html">clone -- Clone current object</A>
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<LI><A NAME="tex2html333"
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HREF="node42.html">Named Constants</A>
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</UL>
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<BR>
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<LI><A NAME="tex2html334"
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HREF="node43.html">Dense Vector Data Structure</A>
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<UL>
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<LI><A NAME="tex2html335"
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HREF="node44.html">Vector Methods</A>
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<LI><A NAME="tex2html336"
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HREF="node45.html">get_nrows -- Get number of rows in a dense vector</A>
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<LI><A NAME="tex2html337"
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HREF="node46.html">sizeof -- Get memory occupation in bytes
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of a dense vector</A>
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<LI><A NAME="tex2html338"
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HREF="node47.html">set -- Set contents of the vector</A>
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<LI><A NAME="tex2html339"
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HREF="node48.html">get_vect -- Get a copy of the vector contents</A>
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<LI><A NAME="tex2html340"
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HREF="node49.html">clone -- Clone current object</A>
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</UL>
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<BR>
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<LI><A NAME="tex2html341"
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HREF="node50.html">Preconditioner data structure</A>
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<LI><A NAME="tex2html342"
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HREF="node51.html">Heap data structure</A>
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</UL>
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