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Forum: Analysis
Re: None JAS3 (Ibrahim)
Date: 18 Oct, 2007
From: <tony_johnson@slac.stanford.edu>

> I run my program , a file called .aida  is created, when i 
> open it with jas3, i can see the spectrum of gammas. I want 
> to  integrate the surface under the gaussian curve. how can i 
> do it with jas3 ?

HI Adam, I think from your question and your earlier questions on the JAS3 mailing list that you might need to understand the basics of how histograms work. Wikipedia might be a good starting point: 

http://en.wikipedia.org/wiki/Histogram

Basically when you histogram a quantity x, you see a plot which shows the number of entries in each bin in x. In the statistics box you will see the mean value of x, the RMS which is a measure of the spread around x, and the entries, which is the total count of entries you made in the histogram. The entries is basically equaivalent to the total area under the curve. You can also do a guassian fit to your histogram from that get the gaussian parameters corresponding to your curve.

If you have more questions about JAS3 specific features I would suggest posting them on the JAS3 discussing forum at:

http://forum.freehep.org/index.php?t=thread&frm_id=3

If you also attach your .aida file there and explain in a little more detail what you want to achieve we can probably help more.

Tony

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