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/*
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 * $Id: dvar.cpp 1942 2014-04-28 22:22:45Z johnoel $
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 *
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 * Author: David Fournier
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 * Copyright (c) 2008-2012 Regents of the University of California
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 */
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/**
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 * \file
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 * Description not yet available.
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 */
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// file fvar_fn.cpp
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// math.h functions involving prevariables
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#include "fvar.hpp"
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#ifdef __TURBOC__
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  #pragma hdrstop
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  #include <iostream.h>
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   #include <iomanip.h>
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#endif
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#ifdef __ZTC__
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  #include <iostream.hpp>
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   #include <iomanip.hpp>
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#endif
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#include <stdio.h>
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#include <math.h>
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/**
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 * Description not yet available.
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 * \param
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 */
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double sigmoid(const double v1)
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 {
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   return(atan(v1)/2.8);
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 }