GooFit::FCN Class Reference

#include <FCN.h>

Inheritance diagram for GooFit::FCN:

Public Member Functions
	FCN (Params &params)
	Create an FCN given parameters (PDF reference is inside params) More...
double	operator() (const std::vector< double > &pars) const override
	Run the fit (used by Minuit2 class) More...
double	operator() () const
	produce the FCN value for the current values of the parameters More...
double	Up () const override
	This value is 0.5 for ll, 1 for chi2. More...
Params *	GetParams ()
	Get a pointer to the parameters. More...

Protected Attributes
Params *	params_

Detailed Description

Definition at line 11 of file FCN.h.

Constructor & Destructor Documentation

FCN()

GooFit::FCN::FCN

(

Params &

params

)

Create an FCN given parameters (PDF reference is inside params)

Definition at line 9 of file FCN.cpp.

References GooFit::host_callnumber, params_, GooFit::Variable::setChanged(), and GooFit::Params::vars_.

    : params_(&params) {
    host_callnumber = 0;

    // Verify that all varaibles need to be recached
    for(Variable &var : params_->vars_)
        var.setChanged(true);
}

Member Function Documentation

GetParams()

Params * GooFit::FCN::GetParams

(

)

Get a pointer to the parameters.

Definition at line 44 of file FCN.cpp.

References params_.

Referenced by Up().

{ return params_; }

operator()() [1/2]

double GooFit::FCN::operator() ( const std::vector< double > &  pars ) const

override

Run the fit (used by Minuit2 class)

Definition at line 18 of file FCN.cpp.

References GooFit::PdfBase::calculateNLL(), GooFit::Params::from_minuit_vector(), GOOFIT_TRACE, GooFit::host_callnumber, params_, and GooFit::Params::pdf_.

                                                          {
    // Translate from Minuit indexing to GooFit indexing
    params_->from_minuit_vector(pars);

    GOOFIT_TRACE("Calculating NLL");
    double nll = params_->pdf_->calculateNLL();

    host_callnumber++;

    return nll;
}

operator()() [2/2]

double GooFit::FCN::operator()

(

)

const

produce the FCN value for the current values of the parameters

Definition at line 30 of file FCN.cpp.

References GooFit::PdfBase::calculateNLL(), GooFit::Params::from_minuit_vector(), GOOFIT_TRACE, GooFit::host_callnumber, GooFit::Params::make_minuit_vector(), params_, and GooFit::Params::pdf_.

                             {
    // Make a vector of current values, then force the recalculation step
    std::vector<double> pars = params_->make_minuit_vector();
    params_->from_minuit_vector(pars, true);

    GOOFIT_TRACE("Calculating NLL");
    double nll = params_->pdf_->calculateNLL();

    host_callnumber++;

    return nll;
}

Up()

double GooFit::FCN::Up ( ) const

inlineoverride

This value is 0.5 for ll, 1 for chi2.

Definition at line 26 of file FCN.h.

References GetParams().

{ return 0.5; }

Member Data Documentation

params_

Params* GooFit::FCN::params_

protected

Definition at line 13 of file FCN.h.

Referenced by FCN(), GetParams(), and operator()().

---

The documentation for this class was generated from the following files:

• /home/travis/build/GooFit/GooFit/include/goofit/fitting/FCN.h
• /home/travis/build/GooFit/GooFit/src/goofit/FCN.cpp