Options for saving best-fit values for parameters w/o running Hesse and for loading parameters from a RooArgList #688
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…trix + option to load parameters from a RooArgList
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This adds an option
--saveFitResultWithoutHesseto save the best fit parameter values to fit_mdf without triggering the Hesse run.After some postprocessing (see PR in summer21 repository) into a RooArgList of fit parameters these can then be loaded to set the initial values of a new fit using
--setParametersFromList <filename.root>wherefilename.rootshould contain a RooArgListfitparsthat will be used to set the parameter values (the creation of this is taken care of by the postprocessing script)The idea is that you can use the best fit values of a fit with a slightly different configuration as a starting point, e.g. the inclusive mu fit from the STXS fit, or the combined fit with the information from the fits of individual channels. The latter was tested in a combination of hgg, hzz, vhbb, tthbb, tthll (ie main STXS channels except hww, which had some problems), where the initial fit time was reduced by 30% by setting the initial NP values from the fit to those obtained from the individual channel fits.