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<html><head><title>extrema</title></head><body bgcolor=white><h1 align=center>Description of the program: <font color=Blue>extrema</font></h1><hr>This program determines the maxima (minima) of one component of apossibly multivariate time series. Thiscorresponds to a <a href="../chaospaper/node11.html">Poincaré section</a> at the zeros of the derivative.To get a better estimate of the extremum, a quadratic interpolation is done.<p><font color=red><b>Note:</b></font> Very sensitive to noise!<hr><h2 align=center>Usage:</h2><center><font color=Red>extrema [Options]</font><p>Everything not being a valid option will be interpreted as a potential datafile name. Given no datafile at all, means read stdin. Also <font color=Red>-</font> means stdin<p>Possible options are:<p><table border=2><tr><th>Option<th>Description<th>Default</tr><tr><th>-l#<td>number of points to use<td>whole file</tr><tr><th>-x#<td>number of lines to be ignored<td>0</tr><tr><th>-m#<td># of components<td>1</tr><tr><th>-c#<td><a href=../general.html#column>columns to be read</a><td>1,...,# of components</tr><tr><th>-w#<td>which components to maxi(mini)mize<td>1</tr><tr><th>-z<td>determine minima instead of maxima<td>maxima</tr><tr><th>-t#<td>minimal time required between two extrema<td>0.0</tr><tr><th>-o#<td><a href=../general.html#outfile>output file name</a><td>without file name: 'datafile'.ext<br>(or stdin.ext if data were read from stdin)<br>if no -o is given stdout is used</tr><tr><th>-V#<td><a href=../general.html#verbosity>verbosity level</a><br> 0: only panic messages<br> 1: add input/output messages<td>1</tr><tr><th>-h<td>show these options<td>none</tr></table></center><hr><h2 align=center>Description of the Output:</h2>The output consists of m+1 columns:<ul><li>First m columns: The position of the extrema</li><li>Last column: The time between the last two extrema</li></ul>Note that the time given for the first extremum (the first row in theoutput file) is the absolute time from the start of the time series(t=0) to the first extremum.<hr>View the <a href="../../source_c/extrema.c"> C-sources</a>.<hr><a href=../contents.html>Table of Contents</a> * <a href="../../index.html" target="_top">TISEAN home</a></body></html>⌨️ 快捷键说明
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