Confidence interval for an imported tf1

[ratkin]

I have the parameters and errors on those parameters for a TF1. I want to draw that TF1 on a histogram with the confidence interval (or error band) of that fit as well.
There is a way to do this (as shown below from the ROOT tutorial on confidence intervals) but this requires a histogram to be fit with a function and then calculating the confidence interval. In my case I’m not fitting a histogram but rather drawing a separate TF1 on top of a histogram. Is there a way to do this?

h->Fit(f, "Q");
h->Draw();
/*Create a histogram to hold the confidence intervals*/
TH1D *hint = new TH1D("hint","Fitted gaussian with .95 conf.band", 100, -3, 3);
(TVirtualFitter::GetFitter())->GetConfidenceIntervals(hint);

For example if I have the following function, how can I draw its confidence interval (or error band)

TF1 * f1 = new TF1(“f1”, “[0]+[1]*x”);
f1->SetParameters(0,3);
f1->SetParErrors(1,1);

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ROOT Version: Not Provided
Platform: Not Provided
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