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PdfFuncMathMore.h
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1// @(#)root/mathmore:$Id$
2// Authors: L. Moneta, A. Zsenei 08/2005
3
4 /**********************************************************************
5 * *
6 * Copyright (c) 2004 ROOT Foundation, CERN/PH-SFT *
7 * *
8 * This library is free software; you can redistribute it and/or *
9 * modify it under the terms of the GNU General Public License *
10 * as published by the Free Software Foundation; either version 2 *
11 * of the License, or (at your option) any later version. *
12 * *
13 * This 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 library (see file COPYING); if not, write *
20 * to the Free Software Foundation, Inc., 59 Temple Place, Suite *
21 * 330, Boston, MA 02111-1307 USA, or contact the author. *
22 * *
23 **********************************************************************/
24
25
26#ifndef ROOT_Math_PdfFuncMathMore
27#define ROOT_Math_PdfFuncMathMore
28
29namespace ROOT {
30 namespace Math {
31
32
33 /**
34
35 Probability density function of the non central \f$\chi^2\f$ distribution with \f$r\f$
36 degrees of freedom and the noon-central parameter \f$\lambda\f$
37
38 \f[ p_r(x) = \frac{1}{\Gamma(r/2) 2^{r/2}} x^{r/2-1} e^{-x/2} \f]
39
40 for \f$x \geq 0\f$.
41 For detailed description see
42 <A HREF="http://mathworld.wolfram.com/NoncentralChi-SquaredDistribution.html">
43 Mathworld</A>.
44
45 @ingroup PdfFunc
46
47 */
48
49 double noncentral_chisquared_pdf(double x, double r, double lambda);
50
51 } //end namespace Math
52} // end namespace ROOT
53
54
55// make a fake class to auto-load functions from MathMore
56
57namespace ROOT {
58 namespace Math {
59
61
62 public:
63
64 // adding this method with force the auto-loading of the library
65 static void Load();
66 };
67
69 }
70
71}
72
73
74
75#endif // ROOT_Math_PdfFuncMathMore
ROOT::R::TRInterface & r
Definition: Object.C:4
double noncentral_chisquared_pdf(double x, double r, double lambda)
Probability density function of the non central distribution with degrees of freedom and the noon-c...
Double_t x[n]
Definition: legend1.C:17
Namespace for new Math classes and functions.
MathMoreLib MathMoreLibrary
tbb::task_arena is an alias of tbb::interface7::task_arena, which doesn't allow to forward declare tb...