randomize_perm.html

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<html> <head><title>Permutation schemes</title></head><body bgcolor="#ffffff"><h3>Permutation schemes</h3>The <a href="randomize_extend.html">extendable</a> family of routines for thegeneration of annealed surrogate data can accomodate different permutationschemes. In this version, the most important module implements the exchange ofrandomly chosen pairs. An (yet unimplemented) alternative is, at lowertemperatures,  to select pairs of comparable magnitudes in order to increasethe acceptance rate.<p>For the particulat purpose of generating series of inter-event intervals, itmay be computationally better to exchange two adjacent intervals only, since inthat case only one event time changes.<h4>Random pairs</h4><p><fontcolor=blue><tt>randomize_</tt><em>cost</em><tt>_</tt><em>cool</em><tt>_</tt><fontcolor=red><tt>random</tt></font><tt> [-X </tt><em>xfile</em><tt>][</tt><em>general options</em><tt>] [</tt><em>cost function options</em><tt>] [</tt><em>cooling options</em><tt>] </tt><em>file</em></font><blockquote>     <font color=blue><tt> -X </tt><em>xfile</em></font>   file containing list of indices excluded from permutation</blockquote>At each annealing step, one pair of values is exchanged. Here, two disjointindices are selected at random. It is possible to specify a list of indiceswhich shall be excluded from permutations. This can be useful if the data hasartefacts (e.g. zeroed gaps) and if the boundary points are to be kept fixed.The file <font color=blue><em>xfile</em></font> is expected to contain one(integer) index per line.<p><h4>Adjacent intervals</h4><p><fontcolor=blue><tt>randomize_</tt><em>cost</em><tt>_</tt><em>cool</em><tt>_</tt><fontcolor=red><tt>event</tt></font><tt> [</tt><em>general options</em><tt>] [</tt><em>cost function options</em><tt>] [</tt><em>cooling options</em><tt>] </tt><em>file</em></font><p>At each annealing step, one adjacent pair of inter-event intervals is exchanged. That is, one event time selected at random is changed.Note that the first and last events are always ket fixed.<p><a href="randomize.html"><em>constrained randomization</em></a> *<a href="../contents.html">Table of Contents</a> * <a href="../../index.html" target="_top">TISEAN home</a></body></html>

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