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<html> <head><title>Determine end-to-end mismatch before making surrogate data</title></head><body bgcolor="#ffffff"><h3>Determine end-to-end mismatch before making surrogate data</h3><font color=blue><tt>endtoend [-o </tt><em>outfile</em><tt> -l# -x# -m# -c#[,#]-V# -h] </tt><em> file</em></font><blockquote> <br> <font color=blue><tt> -o </tt></font><a href=../general.html#outfile>output file name</a>, just <font color=blue><tt> -o </tt></font>means <font color=blue><em>file</em></font><font color=blue><tt>_end</tt></font> <br> <font color=blue><tt> -l </tt></font>number of points (whole file) <br> <font color=blue><tt> -x </tt></font>number of values to be skipped (0) <br> <font color=blue><tt> -m </tt></font>number of <a href=../general.html#columns>columns to be read</a> (1) <br> <font color=blue><tt> -c </tt></font><a href=../general.html#columns>columns to be read</a> (1) <br> <font color=blue><tt> -V </tt></font><a href=../general.html#verbosity>verbosity level</a> (0 = only fatal errors) <br> <font color=blue><tt> -h </tt></font>show this message</blockquote>Determine the effect of an end-to-end mismatch on the autocorrelationstructure for various sub-sequence lenths. It is important to avoid <a href="../surropaper/node14.html">jumps andphase slips</a> that occur when the data is periodically continued when makingFourier based surrogates, e.g. with <a href="surrogates.html">surrogates</a>.<p>The mismatch in value is <a href="../surropaper/node34.html#endtoend">measured</a> by <pre> / \ 2 | x(1)-x(N) | \ /d = __________________ jump __ \ / _ \ 2 | | x(n)-x | /__ \ / </pre>and the phase slip by<pre> / \ 2 | (x(2)-x(1))-(x(N)-x(N-1)) | \ /d = _________________________________ slip __ . \ / _ \ 2 | | x(n)-x | /__ \ / </pre>The weighted mismatch is then <pre> j*d + (1-j)*d . jump slip</pre>In the multivariate case, the values of d are computed for each channelseperately and then averaged.<p>The sub-sequence length is successively decreased, only considering lengthswhich can be factorized with factors 2, 3 and 5 (that is what <ahref="surrogates.html">surrogates</a> can handle). For each length, the optimaltime offset is determined and a result is printed whenever an improvement wasfound. You can then use the <font color=blue><tt> -x </tt></font> and <font color=blue><tt> -l </tt></font> options to <a href="choose.html">choose</a> that sub-sequence for <a href="surrogates.html">surrogates</a>.<p><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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