Marsyas  0.6.0-alpha
/usr/src/RPM/BUILD/marsyas-0.6.0/src/marsyas/marsystems/Centroid.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 "Centroid.h"
00021 #include "../common_source.h"
00022 
00023 using std::ostringstream;
00024 using namespace Marsyas;
00025 
00026 Centroid::Centroid(mrs_string name):MarSystem("Centroid", name)
00027 {
00028   m0_ = 0.0;
00029   m1_ = 0.0;
00030 }
00031 
00032 Centroid::~Centroid()
00033 {
00034 }
00035 
00036 MarSystem*
00037 Centroid::clone() const
00038 {
00039   return new Centroid(*this);
00040 }
00041 
00042 void
00043 Centroid::myUpdate(MarControlPtr sender)
00044 {
00045   (void) sender;  //suppress warning of unused parameter(s)
00046 
00047   MRSDIAG("Centroid.cpp - Centroid:myUpdate");
00048   ctrl_onSamples_->setValue(ctrl_inSamples_, NOUPDATE);
00049   ctrl_onObservations_->setValue((mrs_natural)1, NOUPDATE);
00050   ctrl_osrate_->setValue(ctrl_israte_, NOUPDATE);
00051   ctrl_onObsNames_->setValue("Centroid_" + ctrl_inObsNames_->to<mrs_string>() , NOUPDATE);
00052 }
00053 
00054 void
00055 Centroid::myProcess(realvec& in, realvec& out)
00056 {
00057   mrs_natural o,t;
00058   // computer centroid of observations for each time sample
00059   // using zero and first-order moments
00060   for (t = 0; t < inSamples_; t++)
00061   {
00062     m0_ = 0.0;
00063     m1_ = 0.0;
00064     for (o=0; o < inObservations_; o++)
00065     {
00066       m1_ += o * in(o,t);
00067       m0_ += in(o,t);
00068     }
00069     if (m0_ != 0.0)
00070       out(0,t) = (m1_ / m0_) / inObservations_;
00071     else
00072       out(0,t) = 0.5;
00073   }
00074 
00075 }