hi ROOT people, i am just wondering if there is an easy way to get the error of a fit. i'm fitting something like this (for example) ffgr = new TGraphErrors(imax, x, y, dx, dy); ffgr->Fit(func,"","",xmin,xmax); TF1 *fitfunc; fitfunc = ffgr->GetFunction(func); so once i have the fitting function, i know how to get parameters, chi^2, parameter errors, etc. what i want is the estimated error on the function itself so i can draw an error band. i've seen a lot of stuff in ROOTtalk about how to get the covariance matrix, so i can do that to calculate the error myself from the covariance matrix, but it seems like there must be something like ffgr->GetError(x), or ffgr->EvalError(x), or whatever to get the error as calculated from the covariance matrix so i don't have to do all the work myself. any ideas? thanks, jason
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