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Keywords: histogram
Forum: Analysis
Re: None AIDA histogram analysis problem (Lei Zhu)
Re: None FW: AIDA histogram analysis problem
Date: 10 Aug, 2003
From: Lei Zhu <>

Hi, Tony,

It seems my case is a little complicated... I have the two histograms: hist1 and hist2, and need to get the ratio hist1/hist2. However, some part of hist2 is zero, so if I follow the method you mentioned below, I will get infinity in the resulted new histogram. What I want to do is just set those parts zero, and the other still the ratio of the two histograms. How to deal with this problem?

Regards, Lei

> Hi, I need to analyze the data got in simulation. Now I have
> two histograms, both are AIDA::IHistogram1D*, with the same 
> x-axis range and bin number. I want to get the ratio of the 
> two datasets along x-axis, how to do it?

Hi, use the method,

 AIDA::IHistogramFactory.divide(String name, IHistogram1D hist1,IHistogram1D hist2) 

Where name is the name of the new histogram, and hist1 and hist2 are the existing histograms to be divded. E.g.

     IHistogram1D* newHist = hf->divide("newHistName",hist1,hist2);

Where hf is a pointer to your AIDA::IHistogramFactory.


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