/usr/include/CLHEP/GenericFunctions/Landau.hh is in libclhep-dev 2.1.2.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// $Id: Landau.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $
//---------------------Landau-----------------------------------------------//
// //
// Class Landau //
// Joe Boudreau, November 1999 //
// //
//--------------------------------------------------------------------------//
#ifndef Landau_h
#define Landau_h 1
#include "CLHEP/GenericFunctions/AbsFunction.hh"
#include "CLHEP/GenericFunctions/Parameter.hh"
namespace Genfun {
/**
* @author
* @ingroup genfun
*/
class Landau : public AbsFunction {
FUNCTION_OBJECT_DEF(Landau)
public:
// Constructor
Landau();
// Copy constructor
Landau(const Landau &right);
// Destructor
virtual ~Landau();
// Retreive function value
virtual double operator ()(double argument) const;
virtual double operator ()(const Argument & a) const {return operator() (a[0]);}
// Get the mean of the Landau
Parameter & peak();
const Parameter & peak() const;
// Get the sigma of the Landau
Parameter & width();
const Parameter & width() const;
private:
// It is illegal to assign an adjustable constant
const Landau & operator=(const Landau &right);
// Here is the decay constant
Parameter _peak;
// Here is the sigma
Parameter _width;
// The old cernlib routine does the work:
double _denlan(double x) const;
};
} // namespace Genfun
#endif
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