00001 /*************************************************************************** 00002 ** 00003 ** This file is part of QGpCoreTools. 00004 ** 00005 ** This library is free software; you can redistribute it and/or 00006 ** modify it under the terms of the GNU Lesser General Public 00007 ** License as published by the Free Software Foundation; either 00008 ** version 2.1 of the License, or (at your option) any later version. 00009 ** 00010 ** This file is distributed in the hope that it will be useful, but WITHOUT 00011 ** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 00012 ** FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 00013 ** License for more details. 00014 ** 00015 ** You should have received a copy of the GNU Lesser General Public 00016 ** License along with this library; if not, write to the Free Software 00017 ** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00018 ** 00019 ** 00020 ** 00021 ** Created: 2012-11-26 00022 ** Authors: 00023 ** Marc Wathelet (ISTerre, Grenoble, France) 00024 ** 00025 ***************************************************************************/ 00026 00027 #ifndef COVARIANCE_H 00028 #define COVARIANCE_H 00029 00030 #include "QGpCoreToolsDLLExport.h" 00031 #include "DoubleMatrix.h" 00032 #include "Ellipse.h" 00033 00034 namespace QGpCoreTools { 00035 00036 class QGPCORETOOLS_EXPORT Covariance 00037 { 00038 public: 00039 Covariance(int n); 00040 ~Covariance(); 00041 00042 void add(double * val); 00043 void reset(); 00044 00045 DoubleMatrix matrix() const; 00046 Ellipse stddev2D() const; 00047 double mean(int i) const {return _sums[i]/_count;} 00048 private: 00049 double * _xProducts; 00050 double * _sums; 00051 int _n, _nx, _count; 00052 }; 00053 00054 } // namespace QGpCoreTools 00055 00056 #endif // COVARIANCE_H
