MatrixInverseVariable.cc

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// -*- C++ -*-

// PLearn (A C++ Machine Learning Library)
// Copyright (C) 1998 Pascal Vincent
// Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal
// Copyright (C) 2001-2002 Nicolas Chapados, Ichiro Takeuchi, Jean-Sebastien Senecal
// Copyright (C) 2002 Xiangdong Wang, Christian Dorion

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/* *******************************************************      
   * $Id: MatrixInverseVariable.cc,v 1.5 2004/04/27 16:02:26 morinf Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#include "MatrixInverseVariable.h"

namespace PLearn {
using namespace std;


PLEARN_IMPLEMENT_OBJECT(MatrixInverseVariable,
                        "Matrix inversions... ",
                        "NO HELP");

MatrixInverseVariable::MatrixInverseVariable(Variable* input)
  : inherited(input, input->length(), input->width()) 
{}

void MatrixInverseVariable::recomputeSize(int& l, int& w) const
{
    if (input) {
        l = input->length();
        w = input->width();
    } else
        l = w = 0;
}

void MatrixInverseVariable::fprop()
{
  inverse(input->matValue,matValue);
}


void MatrixInverseVariable::bprop()
{
  PLERROR("MatrixInverseVariable: bprop not implemented yet");
}


void MatrixInverseVariable::symbolicBprop()
{
  PLERROR("MatrixInverseVariable: symbolicBprop not implemented yet");
}



} // end of namespace PLearn

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