ROOT   Reference Guide
BasicMinimumError.cxx
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1// @(#)root/minuit2:$Id$
2// Authors: M. Winkler, F. James, L. Moneta, A. Zsenei 2003-2005
3
4/**********************************************************************
5 * *
6 * Copyright (c) 2005 LCG ROOT Math team, CERN/PH-SFT *
7 * *
8 **********************************************************************/
9
11
12#include "Minuit2/MnMatrix.h"
13
14#if defined(DEBUG) || defined(WARNINGMSG)
15#include "Minuit2/MnPrint.h"
16#endif
17
18
19namespace ROOT {
20
21 namespace Minuit2 {
22
23
24
26 // calculate Heassian: inverse of error matrix
28 int ifail = Invert(tmp);
29 if(ifail != 0) {
30#ifdef WARNINGMSG
31 MN_INFO_MSG("BasicMinimumError: inversion fails; return diagonal matrix.");
32#endif
34 for(unsigned int i = 0; i < fMatrix.Nrow(); i++) {
35 tmp2(i,i) = 1./fMatrix(i,i);
36 }
37 return tmp2;
38 }
39 return tmp;
40}
41
42 } // namespace Minuit2
43
44} // namespace ROOT
#define MN_INFO_MSG(str)
Definition: MnPrint.h:110
MnAlgebraicSymMatrix Hessian() const
Class describing a symmetric matrix of size n.
Definition: LASymMatrix.h:51
unsigned int Nrow() const
Definition: LASymMatrix.h:239
int Invert(LASymMatrix &)
Definition: LaInverse.cxx:22
tbb::task_arena is an alias of tbb::interface7::task_arena, which doesn't allow to forward declare tb...
Definition: StringConv.hxx:21