| 1 | // $Id: KernelTriCube.cc 1392 2008-07-28 19:35:30Z peter $ |
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| 2 | |
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| 3 | /* |
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| 4 | Copyright (C) 2005 Peter Johansson |
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| 5 | Copyright (C) 2006 Jari Häkkinen |
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| 6 | Copyright (C) 2007 Jari Häkkinen, Peter Johansson |
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| 7 | |
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| 8 | This file is part of the yat library, http://dev.thep.lu.se/yat |
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| 9 | |
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| 10 | The yat library is free software; you can redistribute it and/or |
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| 11 | modify it under the terms of the GNU General Public License as |
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| 12 | published by the Free Software Foundation; either version 2 of the |
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| 13 | License, or (at your option) any later version. |
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| 14 | |
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| 15 | The yat library is distributed in the hope that it will be useful, |
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| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 18 | General Public License for more details. |
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| 19 | |
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| 20 | You should have received a copy of the GNU General Public License |
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| 21 | along with this program; if not, write to the Free Software |
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| 22 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
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| 23 | 02111-1307, USA. |
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| 24 | */ |
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| 25 | |
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| 26 | #include "KernelTriCube.h" |
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| 27 | #include "Kernel.h" |
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| 28 | |
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| 29 | #include <cmath> |
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| 30 | |
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| 31 | namespace theplu { |
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| 32 | namespace yat { |
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| 33 | namespace regression { |
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| 34 | |
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| 35 | KernelTriCube::KernelTriCube(void) |
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| 36 | : Kernel() |
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| 37 | { |
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| 38 | } |
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| 39 | |
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| 40 | double KernelTriCube::operator()(const double x) const |
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| 41 | { |
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| 42 | if (x>1 || x<-1) |
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| 43 | return 0.0; |
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| 44 | else |
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| 45 | return pow(1-pow(fabs(x),3),3); |
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| 46 | } |
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| 47 | |
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| 48 | }}} // of namespaces regression, yat, and theplu |
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