PLearn 0.1
MatRowVariable.cc
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00001 // -*- C++ -*-
00002 
00003 // PLearn (A C++ Machine Learning Library)
00004 // Copyright (C) 1998 Pascal Vincent
00005 // Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal
00006 // Copyright (C) 2001-2002 Nicolas Chapados, Ichiro Takeuchi, Jean-Sebastien Senecal
00007 // Copyright (C) 2002 Xiangdong Wang, Christian Dorion
00008 
00009 // Redistribution and use in source and binary forms, with or without
00010 // modification, are permitted provided that the following conditions are met:
00011 // 
00012 //  1. Redistributions of source code must retain the above copyright
00013 //     notice, this list of conditions and the following disclaimer.
00014 // 
00015 //  2. Redistributions in binary form must reproduce the above copyright
00016 //     notice, this list of conditions and the following disclaimer in the
00017 //     documentation and/or other materials provided with the distribution.
00018 // 
00019 //  3. The name of the authors may not be used to endorse or promote
00020 //     products derived from this software without specific prior written
00021 //     permission.
00022 // 
00023 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00024 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00025 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00026 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00027 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00028 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00029 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00030 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00031 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00032 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00033 // 
00034 // This file is part of the PLearn library. For more information on the PLearn
00035 // library, go to the PLearn Web site at www.plearn.org
00036 
00037 
00038 /* *******************************************************      
00039  * $Id: MatRowVariable.cc 6861 2007-04-09 19:04:15Z saintmlx $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "MatRowVariable.h"
00044 
00045 namespace PLearn {
00046 using namespace std;
00047 
00048 
00052 PLEARN_IMPLEMENT_OBJECT(MatRowVariable,
00053                         "Variable that is the row of matrix mat indexed by variable input",
00054                         "NO HELP");
00055 
00056 MatRowVariable::MatRowVariable(const Mat& mat, Variable* input)
00057     : inherited(input, mat.width(), 1), m(mat)
00058 {
00059     build_();
00060 }
00061 
00062 void
00063 MatRowVariable::build()
00064 {
00065     inherited::build();
00066     build_();
00067 }
00068 
00069 void
00070 MatRowVariable::build_()
00071 {
00072     if(input && !input->isScalar())
00073         PLERROR("IN MatRowVariable(const Mat& mat, Variable* input) input must have nelems() 1 as it is supposed to be an integer index");
00074 }
00075 
00076 void
00077 MatRowVariable::declareOptions(OptionList &ol)
00078 {
00079     declareOption(ol, "m", &MatRowVariable::m, OptionBase::buildoption, "");
00080     inherited::declareOptions(ol);
00081 }
00082 
00083 void
00084 MatRowVariable::recomputeSize(int& l, int& w) const
00085 {
00086     if (m.isNotEmpty())
00087         l=m.width();
00088     w = 1;
00089 }
00090 
00091 void MatRowVariable::makeDeepCopyFromShallowCopy(CopiesMap& copies)
00092 {
00093     inherited::makeDeepCopyFromShallowCopy(copies);
00094     deepCopyField(m, copies);
00095 }
00096 
00097 void MatRowVariable::fprop()
00098 {  value << m(int(input->value[0])); }
00099 
00100 
00101 void MatRowVariable::bprop() {}
00102 
00103 void MatRowVariable::symbolicBprop() {}
00104 
00105 
00106 
00107 } // end of namespace PLearn
00108 
00109 
00110 /*
00111   Local Variables:
00112   mode:c++
00113   c-basic-offset:4
00114   c-file-style:"stroustrup"
00115   c-file-offsets:((innamespace . 0)(inline-open . 0))
00116   indent-tabs-mode:nil
00117   fill-column:79
00118   End:
00119 */
00120 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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