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101 lines
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<H2><A NAME="SECTION00045000000000000000">
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Heap data structure</A>
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<P>
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Among the tools routines of sec. <A HREF="node68.html#sec:toolsrout">6</A>, we have a number
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of sorting utilities; the heap sort is implemented in terms of heaps
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having the following signatures:
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<DL>
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<DT><STRONG><TT>psb_T_heap</TT></STRONG></DT>
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<DD>: a heap containing elements of type T, where T
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can be <code>i,s,c,d,z</code> for integer, real and complex data;
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</DD>
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<DT><STRONG><TT>psb_T_idx_heap</TT></STRONG></DT>
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<DD>: a heap containing elements of type T, as
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above, together with an integer index.
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</DD>
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</DL>
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Given a heap object, the following methods are defined on it:
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<DL>
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<DT><STRONG>init</STRONG></DT>
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<DD>Initialize memory; also choose ascending or descending
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order;
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</DD>
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<DT><STRONG>howmany</STRONG></DT>
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<DD>Current heap occupancy;
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</DD>
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<DT><STRONG>insert</STRONG></DT>
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<DD>Add an item (or an item and its index);
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</DD>
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<DT><STRONG>get_first</STRONG></DT>
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<DD>Remove and return the first element;
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</DD>
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<DT><STRONG>dump</STRONG></DT>
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<DD>Print on file;
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</DD>
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<DT><STRONG>free</STRONG></DT>
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<DD>Release memory.
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</DD>
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</DL>
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These objects are used in MLD2P4 to implement the factorization
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algorithms.
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