Minuit2

From: Patrick Dupre <pd520_at_york.ac.uk>
Date: Sun, 14 Sep 2008 19:16:20 +0100

Hello,

I used the Minuit2 package by derivating a class from FCNBase and by overloading the operator () as it is suggested in the manual: mnusersguide.pdf
I works, but to improve the control on the fit I wanted to use: ModularFunctionMinimizer
So I tried to instantiate the class by:
ModularFunctionMinimizer minimizer (*fFCN, par, stra, 0, 0.1) ; where:
RR_Chi2 *fFCN ;
and where RR_Chi2 is a class derivated from FCNBase (the one that I used before) previously instanciated (fFCN = new RR_Chi2 (x, y))

I get the following compilation error:

Fitter.cpp: In member function 'std::vector<std::vector<double, std::allocator<double> >, std::allocator<std::vector<double, std::allocator<double> > > > ROOT::Minuit2::Fit_RR::Fit()':

Fitter.cpp:418: error: no matching function for call to 
'ROOT::Minuit2::ModularFunctionMinimizer::ModularFunctionMinimizer(ROOT::Minuit2::RR_Chi2&, 
ROOT::Minuit2::MnUserParameters&, ROOT::Minuit2::MnStrategy&, int, 

double)'
/usr/local/include/Minuit2/ModularFunctionMinimizer.h:47: note: candidates
are: ROOT::Minuit2::ModularFunctionMinimizer::ModularFunctionMinimizer()
/usr/local/include/Minuit2/ModularFunctionMinimizer.h:47: note:

ROOT::Minuit2::ModularFunctionMinimizer::ModularFunctionMinimizer(const 
ROOT::Minuit2::ModularFunctionMinimizer&)
Fitter.cpp:418: error: cannot declare variable 'minimizer' to be of 

abstract type 'ROOT::Minuit2::ModularFunctionMinimizer'
/usr/local/include/Minuit2/ModularFunctionMinimizer.h:47: note: because
the following virtual functions are pure within 'ROOT::Minuit2::ModularFunctionMinimizer':
/usr/local/include/Minuit2/ModularFunctionMinimizer.h:86: note:
virtual const ROOT::Minuit2::MinimumSeedGenerator& ROOT::Minuit2::ModularFunctionMinimizer::SeedGenerator() const
/usr/local/include/Minuit2/ModularFunctionMinimizer.h:87: note:
virtual const ROOT::Minuit2::MinimumBuilder& ROOT::Minuit2::ModularFunctionMinimizer::Builder() const

So, it looks like that I cannot instanciate a class ModularFunctionMinimizer that way.
Question 1) how can I do it by keeping my previous code 2) If I have to rewrite my previous code, can I get an example ?

Thank.

-- 
---
==========================================================================
  Patrick DUPRÉ                      |   |
  Department of Chemistry            |   |    Phone: (44)-(0)-1904-434384
  The University of York             |   |    Fax:   (44)-(0)-1904-432516
  Heslington                         |   |
  York YO10 5DD  United Kingdom      |   |    email: pd520_at_york.ac.uk
==========================================================================

Received on Sun Sep 14 2008 - 20:16:31 CEST