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<head><title>Heap data structure</title>
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<h4 class="subsectionHead"><span class="titlemark">3.5 </span> <a
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id="x17-540003.5"></a>Heap data structure</h4>
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<!--l. 1391--><p class="noindent" >Among the tools routines of sec. <a
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href="userhtmlse6.html#x40-770006">6<!--tex4ht:ref: sec:toolsrout --></a>, we have a number of sorting utilities; the heap
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sort is implemented in terms of heaps having the following signatures:
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<dl class="description"><dt class="description">
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<span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_T</span><span
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class="cmtt-10">_heap</span> </dt><dd
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class="description">: a heap containing elements of type T, where T can be <span class="lstinline"></span><span
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class="cmtt-10">i</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10">s</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10">c</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10">d</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10">z</span>
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for integer, real and complex data;
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</dd><dt class="description">
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<span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_T</span><span
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class="cmtt-10">_idx</span><span
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class="cmtt-10">_heap</span> </dt><dd
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class="description">: a heap containing elements of type T, as above, together
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with an integer index.</dd></dl>
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<!--l. 1400--><p class="noindent" >Given a heap object, the following methods are defined on it:
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">init</span> </dt><dd
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class="description">Initialize memory; also choose ascending or descending order;
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</dd><dt class="description">
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<span
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class="cmbx-10">howmany</span> </dt><dd
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class="description">Current heap occupancy;
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</dd><dt class="description">
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<span
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class="cmbx-10">insert</span> </dt><dd
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class="description">Add an item (or an item and its index);
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</dd><dt class="description">
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<span
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class="cmbx-10">get</span><span
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class="cmbx-10">_first</span> </dt><dd
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class="description">Remove and return the first element;
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</dd><dt class="description">
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<span
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class="cmbx-10">dump</span> </dt><dd
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class="description">Print on file;
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</dd><dt class="description">
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<span
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class="cmbx-10">free</span> </dt><dd
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class="description">Release memory.</dd></dl>
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<!--l. 1410--><p class="noindent" >These objects are used in AMG4PSBLAS to implement the factorization algorithms.
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