Adding data points on histogram and fit these points

Hi, Rooters,

I was hoping to do this for a 2-D histogram, but I am taking a 1-D as an example which is presumably easier to explain: finding the points corresponding to 99.5% bin content of each bin, then fit these points. For instance, for a histogram has 3 bins: bin1 content = 100, bin2 content = 1000; bin3 content = 10,000.
I was hoping to: 1, adding these three points of 99.5, 995 and 9950 on the histogram (on-site);
2, fitting these three points (bin1, 99.5; bin2, 995; bin3 9950).

The attached screenshot was have done by my college on Python (for a 2-D histogram, not 1-D). I want to know wether this is achievable on ROOT ?
I know I can take the points out and fitting on a TGraph. Ideally, it would be nicer to do it on the same histogram, instead of doing it with a separate plot, as the screenshot shown.



Please provide the following information:

ROOT Version (e.g. 6.12/02):
Platform, compiler (e.g. CentOS 7.3, gcc6.2):
Mac OS High Sierra 10.13.4
Apple LLVM version 8.1.0 (clang-802.0.41)

If I understand correctly you would like to “add points” in your histograms ?
“Adding points” to an histogram is not very natural as an histogram is a “binned” object. You may consider make a new histogram with more bins but surely using a TGraph seems straighter path as the concept of “point” is really part of it.

Hi, Couet,

Thanks for looking at this.
You are right, I was hoping to add points on histograms.
If this is not a natural feature on ROOT, I will do it on a separate TGraph.



I do not think it is something ROOT specific. Histograms are binned objects being ROOT histograms or not.

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.