/home/marsyas/marsyas/src/marsyas/DeltaFirstOrderRegression.cpp

/*
 ** Copyright (C) 2010 Stefaan Lippens
 **
 ** This program is free software; you can redistribute it and/or modify
 ** it under the terms of the GNU General Public License as published by
 ** the Free Software Foundation; either version 2 of the License, or
 ** (at your option) any later version.
 **
 ** This program is distributed in the hope that it will be useful,
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 ** GNU General Public License for more details.
 **
 ** You should have received a copy of the GNU General Public License
 ** along with this program; if not, write to the Free Software
 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "DeltaFirstOrderRegression.h"

using namespace std;
using namespace Marsyas;

DeltaFirstOrderRegression::DeltaFirstOrderRegression(mrs_string name) :
        MarSystem("DeltaFirstOrderRegression", name)
{
    addControls();
}

DeltaFirstOrderRegression::DeltaFirstOrderRegression(
    const DeltaFirstOrderRegression& a) :
        MarSystem(a)
{
}

DeltaFirstOrderRegression::~DeltaFirstOrderRegression()
{
}

MarSystem*
DeltaFirstOrderRegression::clone() const
{
    return new DeltaFirstOrderRegression(*this);
}

void DeltaFirstOrderRegression::addControls()
{
}

void DeltaFirstOrderRegression::myUpdate(MarControlPtr sender)
{
    MarSystem::myUpdate(sender);
    // prefix obsnames with "DeltaR1"
    mrs_string inObsNames = ctrl_inObsNames_->to<mrs_string> ();
    mrs_string onObsNames = obsNamesAddPrefix(inObsNames, "DeltaR1_");
    ctrl_onObsNames_->setValue(onObsNames, NOUPDATE);

    // Allocate and initialize the buffers.
    this->memory_.stretch(inObservations_, 2);
    this->memory_.setval(0.0);
}

void DeltaFirstOrderRegression::myProcess(realvec& in, realvec& out)
{
    for (o = 0; o < inObservations_; o++)
    {
        // Calculate delta.
        out(o, 0) = 0.5 * (in(o, 0) - memory_(o, 0));
        if (inSamples_ > 1)
        {
            out(o, 1) = 0.5 * (in(o, 1) - memory_(o, 1));
            for (t = 2; t < inSamples_; t++)
            {
                out(o, t) = 0.5 * (in(o, t) - in(o, t - 2));
            }
        }
        // Update memory
        memory_(o, 0) = (inSamples_ >= 2 ? in(o, inSamples_ - 2)
                         : memory_(o, 1));
        memory_(o, 1) = in(o, inSamples_ - 1);
    }
}

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