Uncertainity in the integral of a histogram?

Newbie
1

Hello everyone,
I am trying to get the error on the Integral of a TH1F histogram.

hist1->Integral(bin1, bin2)

Is there any pre-defined functionality to achieve this?

Thanks a lot !

2

Hi,

You can use IntegralAndError function showing here:
https://root.cern.ch/doc/master/classTH1.html#a72750b362fbf8fae7a4c26579ece18bb

An example

	TH1F* hist = new TH1F( "hist", "", 10, 0, 10 );
	hist -> Fill( 3, 4 );
	hist -> Fill( 5 );

	double integral_err;
	double integral_val = hist->IntegralAndError( 3, 4, integral_err );
	printf( "Integral = %.4f +- %.4f\n",
			integral_val, integral_err );

	return 0;
2 Likes
3

Thanks @LongHoa for the assistance.

1 Like
4

glad I can help.