TF1: 1-Dim function class. Change current fill area attributes if necessary. Note that is necessary to provide the number of parameters. Gauss-Legendre integral, see CalcGaussLegendreSamplingPoints. Retrouvez gratuitement et en exclusivité tous les programmes, émissions et séries de TF1 classés par genre.
Therefore to draw on top of an existing picture, specify option "LSAME". Same constructor as above (for TFormula based function) but passing an option strings available options VEC - vectorize the formula expressions (not possible for lambda based expressions) NL - function is not stores in the global list of functions GL - function will be always stored in the global list of functions , independently of the global setting of TF1::DefaultAddToGlobalList. Evaluate function with given coordinates and parameters. At least minpts and at most maxpts calls to the function were performed. Contains, on exit, an estimation of the relative accuracy of the result. Default mode is automatic depending of xmax, xmin and Npx (function points). When the ovariance matrix from the last fit cannot be retrieved, an error message is printed and a a zero value is returned.
Returns the X value corresponding to the minimum value of the function on the (xmin, xmax) interval. Save this object in the file specified by filename. Possible values are: used to return the computed gradient, assumed to be of at least fNpar size. Compute the cumulative function at fNpx points between fXmin and fXmax. the current function may be accessed in static C-like functions when fitting or painting a function. The default integrator defined in ROOT::Math::IntegratorOneDimOptions::DefaultIntegrator() is used If ROOT contains the MathMore library the default integrator is set to be the adaptive ROOT::Math::GSLIntegrator (based on QUADPACK) or otherwise the ROOT::Math::GaussIntegrator is used See the reference documentation of these classes for more information about the integration algorithms To change integration algorithm just do : ROOT::Math::IntegratorOneDimOptions::SetDefaultIntegrator(IntegratorName); Valid integrator names are: In order to use the GSL integrators one needs to have the MathMore library installed. Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). maxpts >= 2^n +2*n*(n+1) +1 if maxpts WARNING! Other possible integrators are MC integrators based on the ROOT::Math::GSLMCIntegrator class Possible methods are : Vegas, Miser or Plain IN case of MC integration the accuracy is determined by the number of function calls, one should be careful not to use a too large value of maxpts. Generating a random number between 0 and 1 (say r1), Look in which bin in the normalized integral r1 corresponds to. Set the maximum value along Y for this function In case the function is already drawn, set also the maximum in the helper histogram. (In case this object is a. Returns the X value corresponding to the maximum value of the function. Compute Quantiles for density distribution of this function. Add to global list of functions (gROOT->GetListOfFunctions() ) return previous status (true if the function was already in the list false if not). Execute method on this object with parameters stored in the. When the poassed pointer to the covariance matrix is null, a covariance matrix from the last fit is retrieved from a global fitter instance when it exists. While GetMinimum works only for 1D function , GetMinimumNDim works for all dimensions since it uses the minimizer interface vector x at beginning will contained the initial point, on exit will contain the result. Then, Brent's method is applied on the bracketed interval epsilon (default = 1.E-10) controls the relative accuracy (if |x| > 1 ) and absolute (if |x| < 1) and maxiter (default = 100) controls the maximum number of iteration of the Brent algorithm If the flag logx is set the grid search is done in log step size This is done automatically if the log scale is set in the current Pad, NOTE: see also TF1::GetMaximumX and TF1::GetX. TF1 graphics function is via the TH1 and TGraph drawing functions. Note that the default value is "L". Return nth moment of function between a and b. Quantile x_q of a probability distribution Function F is defined as, \[ F(x_{q}) = \int_{xmin}^{x_{q}} f dx = q with 0 <= q <= 1. 1-D histogram with a float per channel (see TH1 documentation)}, virtual void SetParName(Int_t ipar, const char *name), virtual TFitResultPtr Fit(const char *formula, Option_t *option="", Option_t *goption="", Double_t xmin=0, Double_t xmax=0), "[&](double *x, double *p){ return p[0]*f1(x) + p[1]*f2(x); }", // use constructor to customize your function object, // function implementation using class data members, //default gaus integration method uses 6 points, //not suitable to integrate on a large domain, //try with user directives computing more points, Expression using variable x and no parameters, Expression using variable x with parameters, Lambda Expression with variable x and parameters, A general C++ function object (functor) with parameters, A member function with parameters of a general C++ class, ROOT::Math::IntegratorMultiDimOptions::SetDefaultIntegrator(), ROOT::Math::IntegratorOneDimOptions::DefaultIntegrator(), Get z axis of the function.