RooAddPdf

Multidimensional models: working with parametrized ranges in a fit. This an example of a fit with an acceptance that changes per-event. pdf = exp(-t/tau) filexlib. Generate two distributions, exponential distribution for the background, In RooFit the **integral* over the histogram is taken as the yield prediction, pdf.fitTo(). ○ RooFit computation graph reorganized as a sequence of functions with no side effects, evaluated by the RooFitDriver.
RooFit implements data models as Probability Density Functions Sum of PDFs is a PDF, product of PDFs is PDF… Gaussian, Exponential, Polynomial,…
Exponential distribution for the background and Gaussian distribution for the signal RooFitResult* r = w.pdf("model")->fitTo(*data,RooFit::Save()
11 Jan 2006 RooFit is distributed as external package with ROOT and is The decay function differs from the exponential p.d.f in that it can also In Roofit, any variable, data point, function, PDF (etc.) There is an exponential PDF already in RooFit (yep you guessed it) RooExponential .
RooFit package » Roofit. Exponential PDF. It computes RooExponential (const char *name, const char *title, RooAbsReal &_x, RooAbsReal &_c).
64/// Compute multiple values of Exponential distribution. 65void RooExponential::computeBatch(cudaStream_t* stream, double* output, size_t nEvents
14 Oct 2008 Binding TFx, external C++ functions as RooFit functions . Single or double-sided exponential decay distribution.

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