1 | // $Id: Polynomial.cc 703 2006-12-18 00:47:44Z jari $ |
---|

2 | |
---|

3 | /* |
---|

4 | Copyright (C) The authors contributing to this file. |
---|

5 | |
---|

6 | This file is part of the yat library, http://lev.thep.lu.se/trac/yat |
---|

7 | |
---|

8 | The yat library is free software; you can redistribute it and/or |
---|

9 | modify it under the terms of the GNU General Public License as |
---|

10 | published by the Free Software Foundation; either version 2 of the |
---|

11 | License, or (at your option) any later version. |
---|

12 | |
---|

13 | The yat library is distributed in the hope that it will be useful, |
---|

14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|

15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|

16 | General Public License for more details. |
---|

17 | |
---|

18 | You should have received a copy of the GNU General Public License |
---|

19 | along with this program; if not, write to the Free Software |
---|

20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
---|

21 | 02111-1307, USA. |
---|

22 | */ |
---|

23 | |
---|

24 | #include "Polynomial.h" |
---|

25 | #include "yat/utility/matrix.h" |
---|

26 | #include "yat/utility/vector.h" |
---|

27 | |
---|

28 | namespace theplu { |
---|

29 | namespace yat { |
---|

30 | namespace regression { |
---|

31 | |
---|

32 | Polynomial::Polynomial(size_t power) |
---|

33 | : OneDimensional(), mse_(0), power_(power) |
---|

34 | { |
---|

35 | } |
---|

36 | |
---|

37 | Polynomial::~Polynomial(void) |
---|

38 | { |
---|

39 | } |
---|

40 | |
---|

41 | void Polynomial::fit(const utility::vector& x, const utility::vector& y) |
---|

42 | { |
---|

43 | utility::matrix X=utility::matrix(x.size(),power_+1,1); |
---|

44 | for (size_t i=0; i<X.rows(); ++i) |
---|

45 | for (u_int j=1; j<X.columns(); j++) |
---|

46 | X(i,j)=X(i,j-1)*x(i); |
---|

47 | md_.fit(X,y); |
---|

48 | } |
---|

49 | |
---|

50 | double Polynomial::predict(const double x) const |
---|

51 | { |
---|

52 | utility::vector vec(power_+1,1); |
---|

53 | for (size_t i=1; i<=power_; ++i) |
---|

54 | vec(i) = vec(i-1)*x; |
---|

55 | return md_.predict(vec); |
---|

56 | } |
---|

57 | |
---|

58 | |
---|

59 | double Polynomial::standard_error(const double x) const |
---|

60 | { |
---|

61 | utility::vector vec(power_+1,1); |
---|

62 | for (size_t i=1; i<=power_; ++i) |
---|

63 | vec(i) = vec(i-1)*x; |
---|

64 | return md_.standard_error(vec); |
---|

65 | } |
---|

66 | |
---|

67 | }}} // of namespaces regression, yat, and theplu |
---|