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Document DESC%CNV method and MOLD arguments to CDASB and PREC%BUILD

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Salvatore Filippone
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<TITLE>Computational routines</TITLE>
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<TITLE>Heap data structure</TITLE>
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<H1><A NAME="SECTION00050000000000000000">
Computational routines</A>
</H1>
<H2><A NAME="SECTION00045000000000000000">
Heap data structure</A>
</H2>
<P>
<BR><HR>
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
Among the tools routines of sec.&nbsp;<A HREF="node71.html#sec:toolsrout">6</A>, we have a number
of sorting utilities; the heap sort is implemented in terms of heaps
having the following signatures:
<DL>
<DT><STRONG><TT>psb_T_heap</TT></STRONG></DT>
<DD>: a heap containing elements of type T, where T
can be <code>i,s,c,d,z</code> for integer, real and complex data;
</DD>
<DT><STRONG><TT>psb_T_idx_heap</TT></STRONG></DT>
<DD>: a heap containing elements of type T, as
above, together with an integer index.
</DD>
</DL>
Given a heap object, the following methods are defined on it:
<DL>
<DT><STRONG>init</STRONG></DT>
<DD>Initialize memory; also choose ascending or descending
order;
</DD>
<DT><STRONG>howmany</STRONG></DT>
<DD>Current heap occupancy;
</DD>
<DT><STRONG>insert</STRONG></DT>
<DD>Add an item (or an item and its index);
</DD>
<DT><STRONG>get_first</STRONG></DT>
<DD>Remove and return the first element;
</DD>
<DT><STRONG>dump</STRONG></DT>
<DD>Print on file;
</DD>
<DT><STRONG>free</STRONG></DT>
<DD>Release memory.
</DD>
</DL>
These objects are used in MLD2P4 to implement the factorization
algorithms.
<UL>
<LI><A NAME="tex2html872"
HREF="node52.html">psb_geaxpby -- General Dense Matrix Sum</A>
<LI><A NAME="tex2html873"
HREF="node53.html">psb_gedot -- Dot Product</A>
<LI><A NAME="tex2html874"
HREF="node54.html">psb_gedots -- Generalized Dot Product</A>
<LI><A NAME="tex2html875"
HREF="node55.html">psb_normi -- Infinity-Norm of Vector</A>
<LI><A NAME="tex2html876"
HREF="node56.html">psb_geamaxs -- Generalized Infinity Norm</A>
<LI><A NAME="tex2html877"
HREF="node57.html">psb_norm1 -- 1-Norm of Vector</A>
<LI><A NAME="tex2html878"
HREF="node58.html">psb_geasums -- Generalized 1-Norm of Vector</A>
<LI><A NAME="tex2html879"
HREF="node59.html">psb_norm2 -- 2-Norm of Vector</A>
<LI><A NAME="tex2html880"
HREF="node60.html">psb_genrm2s -- Generalized 2-Norm of Vector</A>
<LI><A NAME="tex2html881"
HREF="node61.html">psb_norm1 -- 1-Norm of Sparse Matrix</A>
<LI><A NAME="tex2html882"
HREF="node62.html">psb_normi -- Infinity Norm of Sparse Matrix</A>
<LI><A NAME="tex2html883"
HREF="node63.html">psb_spmm -- Sparse Matrix by Dense Matrix
Product</A>
<LI><A NAME="tex2html884"
HREF="node64.html">psb_spsm -- Triangular System Solve</A>
</UL>
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