Problem in fitting histogram in root

dsahoo · May 6, 2018, 1:17pm

Dear Experts,

I am trying fit a histogram by using exponential function in root. It is giving error as below.

Processing macro_fit.cc…
Limitation: Function can not be defined in a command line or a tempfile
You need to write it in a source file macro_fit.cc:20:
*** Interpreter error recovered ***
root [1]

I am attaching the macro. Please have a look on it and help me to solve it.

Thanks,
Deepakmacro_fit.cc (1.7 KB)

Wile_E_Coyote · May 6, 2018, 1:20pm

Remove the very first line (containing “{”).
Add:

#include <TChain.h>
#include <TF1.h>
#include <TCut.h>

dsahoo · May 6, 2018, 1:43pm

Hi Coyote,

Yes, It’s working. Many thanks. The fitted plot is coming like as attached. If you see, left side of the histogram is not properly fitted.I want to fit it properly. Could you please tell me how to do it?

Thanks,
Deepak

Wile_E_Coyote · May 6, 2018, 1:59pm

Try: h_mm->Fit(fSpectrum, "L"); // "L" or "WL"