Marsyas  0.6.0-alpha
/usr/src/RPM/BUILD/marsyas-0.6.0/src/marsyas/marsystems/StandardDeviation.cpp
Go to the documentation of this file.
00001 /*
00002 ** Copyright (C) 1998-2005 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 #include "StandardDeviation.h"
00020 #include "../common_source.h"
00021 
00022 using namespace std;
00023 using namespace Marsyas;
00024 
00025 StandardDeviation::StandardDeviation(mrs_string name): MarSystem("StandardDeviation",name)
00026 {
00027 }
00028 
00029 StandardDeviation::~StandardDeviation()
00030 {
00031 }
00032 
00033 MarSystem*
00034 StandardDeviation::clone() const
00035 {
00036   return new StandardDeviation(*this);
00037 }
00038 
00039 void
00040 StandardDeviation::myUpdate(MarControlPtr sender)
00041 {
00042   (void) sender;  //suppress warning of unused parameter(s)
00043   MRSDIAG("StandardDeviation.cpp - StandardDeviation:myUpdate");
00044 
00045   ctrl_onSamples_->setValue((mrs_natural)1, NOUPDATE);
00046   ctrl_onObservations_->setValue(ctrl_inObservations_, NOUPDATE);
00047   ctrl_osrate_->setValue(ctrl_israte_, NOUPDATE);
00048 
00049   obsrow_.create(ctrl_inSamples_->to<mrs_natural>());
00050 
00051   inObservations_ = ctrl_inObservations_->to<mrs_natural>();
00052 
00053   // Add prefix to the observation names.
00054   mrs_string inObsNames = ctrl_inObsNames_->to<mrs_string>();
00055   ctrl_onObsNames_->setValue(obsNamesAddPrefix(inObsNames, "Std_"), NOUPDATE);
00056 
00057 }
00058 
00059 void
00060 StandardDeviation::myProcess(realvec& in, realvec& out)
00061 {
00062   mrs_natural t,o;
00063   //checkFlow(in,out);
00064   out.setval(0.0);
00065   for (o=0; o < inObservations_; o++)
00066   {
00067     for (t = 0; t < inSamples_; t++)
00068     {
00069       // Calculate mean
00070       obsrow_(t) = in(o,t);
00071     }
00072     out(o,0) = obsrow_.std();
00073   }
00074 
00075   // VERY INEFFICIENT - LOTS OF MEMORY ALLOCATION AND COPYING
00076   // out = in.stdObs();
00077 }