class ROOT::Math::Interpolator


Class for performing function interpolation of points.
The class is instantiated with an interpolation methods, passed as an enumeration in the constructor.
See Interpolation::Type for the available interpolation algorithms, which are implemented using GSL.
See also the <A HREF=http://www.gnu.org/software/gsl/manual/html_node/Interpolation.html">GSL manual</A> for more information.
The class provides additional methods for computing derivatives and integrals of interpolating functions.

This class does not support copying.
@ingroup Interpolation

Function Members (Methods)

public:
virtual~Interpolator()
doubleDeriv(double x) const
doubleDeriv2(double x) const
doubleEval(double x) const
doubleInteg(double a, double b) const
ROOT::Math::InterpolatorInterpolator(unsigned int ndata = 0, ROOT::Math::Interpolation::Type type = Interpolation::CSPLINE)
ROOT::Math::InterpolatorInterpolator(const vector<double>& x, const vector<double>& y, ROOT::Math::Interpolation::Type type = Interpolation::CSPLINE)
boolSetData(const vector<double>& x, const vector<double>& y)
boolSetData(unsigned int ndata, const double* x, const double* y)
stringType() const
stringTypeGet() const
private:
ROOT::Math::InterpolatorInterpolator(const ROOT::Math::Interpolator&)
ROOT::Math::Interpolator&operator=(const ROOT::Math::Interpolator&)

Data Members

private:
ROOT::Math::GSLInterpolator*fInterppointer to GSL interpolator class

Class Charts

Inheritance Inherited Members Includes Libraries
Class Charts

Function documentation

Interpolator(unsigned int ndata = 0, ROOT::Math::Interpolation::Type type = Interpolation::CSPLINE)
Constructs an interpolator class from  number of data points and with Interpolation::Type type.
The data can be set later on with the SetData method.
In case the data size is not known, better using the default of zero or the next constructor later on.
The defult interpolation type is Cubic spline

Interpolator(const vector<double>& x, const vector<double>& y, ROOT::Math::Interpolation::Type type = Interpolation::CSPLINE)
Constructs an interpolator class from vector of data points \f$ (x_i, y_i )\f$ and with Interpolation::Type type.
The method will compute a continous interpolating function \f$ y(x) \f$ such that \f$ y_i = y ( x_i )\f$.
The defult interpolation type is Cubic spline

virtual ~Interpolator()
Interpolator(const ROOT::Math::Interpolator& )
 usually copying is non trivial, so we make this unaccessible
bool SetData(const vector<double>& x, const vector<double>& y)
Set the data vector ( x[] and y[] )
To be efficient, the size of the data must be the same of the value used in the constructor (ndata)
If this is not  the case a new re-initialization is performed with the new data size

bool SetData(unsigned int ndata, const double* x, const double* y)
Set the data vector ( x[] and y[] )
To be efficient, the size of the data must be the same of the value used when  constructing the class (ndata)
If this is not  the case a new re-initialization is performed with the new data size.

double Eval(double x) const
Return the interpolated value at point x

double Deriv(double x) const
Return the derivative of the interpolated function at point x

double Deriv2(double x) const
Return the second derivative of the interpolated function at point x

double Integ(double a, double b) const
Return the Integral of the interpolated function over the range [a,b]

std::string Type()
Return the type of interpolation method

std::string TypeGet()

Last update: root/mathmore:$Id: Interpolator.h 21637 2008-01-11 09:56:31Z moneta $
Copyright (c) 2004 ROOT Foundation, CERN/PH-SFT *

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