Run a function in ROOT GUI

[Wile_E_Coyote]

BTW. TSpectrum::Search uses a const TH1 *hin parameter so it should accept both float and double. For some examples how one can simultaneously deal with TSpectrum in ROOT 5 and TSpectrum in ROOT 6, see:

Trying to find peak areas using example FitAwmi.C

@axel The standard version of the ${ROOTSYS}/tutorials/spectrum/peaks.C script fits “peaks’ heights”, while the version attached below can fit “peaks’ areas” instead (and you can run this version with ROOT 5 or ROOT 6). peaks.C (4.3 KB)

Trying to find peak areas using example FitAwmi.C

The attached “SpectrumFit.cxx” macro fits 1D spectra using either the AWMI method (an algorithm without matrix inversion) or the Stiefel-Hestens method (a conjugate gradient algorithm) from the TSpectrumFit class. The TSpectrum class is used to find peaks. To try this macro, in a ROOT (5 or 6) prompt, do … … for the “AWMI” method … .x SpectrumFit.cxx ... or ... .x SpectrumFit.cxx++ SpectrumFit(); another random set of peaks (integer areas) SpectrumFit(0, kFALSE); another random set of peaks (…