Marsyas  0.6.0-alpha
/usr/src/RPM/BUILD/marsyas-0.6.0/src/marsyas/marsystems/Kurtosis.cpp
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00001 /*
00002 ** Copyright (C) 1998-2006 George Tzanetakis <gtzan@cs.uvic.ca>
00003 **
00004 ** This program is free software; you can redistribute it and/or modify
00005 ** it under the terms of the GNU General Public License as published by
00006 ** the Free Software Foundation; either version 2 of the License, or
00007 ** (at your option) any later version.
00008 **
00009 ** This program is distributed in the hope that it will be useful,
00010 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 ** GNU General Public License for more details.
00013 **
00014 ** You should have received a copy of the GNU General Public License
00015 ** along with this program; if not, write to the Free Software
00016 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00017 */
00018 
00019 
00020 #include "Kurtosis.h"
00021 #include "../common_source.h"
00022 
00023 using std::ostringstream;
00024 using namespace Marsyas;
00025 
00026 
00027 Kurtosis::Kurtosis(mrs_string name):MarSystem("Kurtosis",name)
00028 {
00029   z_ = 0.0;
00030   b_ = 0.0;
00031   q_ = 0.0;
00032 }
00033 
00034 
00035 Kurtosis::~Kurtosis()
00036 {
00037 }
00038 
00039 
00040 MarSystem*
00041 Kurtosis::clone() const
00042 {
00043   return new Kurtosis(*this);
00044 }
00045 
00046 void
00047 Kurtosis::myUpdate(MarControlPtr sender)
00048 {
00049   (void) sender;  //suppress warning of unused parameter(s)
00050   MRSDIAG("Kurtosis.cpp - Kurtosis:myUpdate");
00051 
00052   setctrl("mrs_natural/onSamples", getctrl("mrs_natural/inSamples"));
00053   setctrl("mrs_natural/onObservations", (mrs_natural)1);
00054   setctrl("mrs_real/osrate", getctrl("mrs_real/israte"));
00055   setctrl("mrs_string/onObsNames", "Kurtosis,");
00056 
00057   //defaultUpdate(); [!]
00058   inObservations_ = getctrl("mrs_natural/inObservations")->to<mrs_natural>();
00059 
00060   obsrow_.create(inObservations_);
00061 }
00062 
00063 
00064 void
00065 Kurtosis::myProcess(realvec& in, realvec& out)
00066 {
00067   mrs_natural o,t;
00068   //checkFlow(in,out);
00069 
00070   // old code for Kurtosis calculation
00071 
00072   /*    for (t = 0; t < inSamples_; t++)
00073       {
00074 
00075         for (o=0; o < inObservations_; o++)
00076         {
00077             obsrow_(o) = in(o,t);
00078         }
00079         z_ = 0.0;
00080         mrs_real mean = obsrow_.mean();
00081         for (o=0; o < inObservations_; o++)
00082         {
00083             b_ =  obsrow_(o) - mean ;
00084 
00085             // take x - u to the fourth power into the sum
00086             z_ += (b_ * b_ * b_ * b_);
00087         }
00088 
00089         // standard deviation to the fourth power
00090         q_ = obsrow_.var() * obsrow_.var();
00091 
00092 
00093         if ((z_ < 1.0e-45)||(q_ < 1.0e-45))
00094             out(0,t) = 0.5;
00095         else
00096         {
00097         // out(0,t) = (mrs_real)((z_ /  q_ * inObservations_) - 3.0);
00098             out(0,t) = (mrs_real)((z_ /  q_ ) - 3.0);
00099         }
00100       }
00101 
00102 
00103     cout << "k1 = " << out(0,0) << endl;
00104   */
00105 
00106 
00107   for (t = 0; t < inSamples_; t++)
00108   {
00109 
00110     for (o=0; o < inObservations_; o++)
00111     {
00112       obsrow_(o) = in(o,t);
00113     }
00114     z_ = 0.0;
00115     mrs_real mean = obsrow_.mean();
00116     for (o=0; o < inObservations_; o++)
00117     {
00118       obsrow_(o) =  obsrow_(o) - mean ;
00119       b_ = obsrow_(o);
00120 
00121       z_ += (b_ * b_ * b_ * b_);
00122       q_  += (b_ * b_);
00123     }
00124     q_ = q_ * q_;
00125     q_ = q_ / inObservations_;
00126 
00127     if ((z_ < 1.0e-45)||(q_ < 1.0e-45))
00128       out(0,t) = 0.5;
00129     else
00130     {
00131       out(0,t) = (mrs_real)((z_ /  q_ ) - 3.0);
00132     }
00133   }
00134 
00135 
00136 //  cout << "k2 = " << out(0,0) << endl;
00137 }