Gausian Fit in a histogram

Newbie
1

I am having trouble getting the Gaussian fit for the histogram. I got the error: too few arguments to a function call, expected at least 2, have 1.

More: I am trying to read the data points from the txt file and make a histogram out of it. If there is a better way to do that or improve my code, please let me know that as well. Thank you very much!

`
TNtuple t(“current_data”, “Data from HV”, “datapoints”);
t.ReadFile(“A.txt”);

TH1F h(“Difference_Hist”, “Differences between Expected and Recorded Value;Difference;Frequency”, 20, -5, 5);
t.Fit(“gaus”);
t.Draw(“datapoints>>Difference_Hist”)
`___
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2

Hi,

how do you expect to fit a TNtuple? We usually fit histograms, not ntuples…

1 Like
3

I am trying to fit the histogram. When I use h.Fit(“gaus”), it says Fit data is empty. Please guide me on how to get the gaussian fit. Thanks!

4

Did you try the fit after filling the histogram (Draw(...) line)?

5

Thank you. It worked!