What's the difference between gammainc & igamma? Which one should I use to compute incomplete upper gamma function? Which one is scaled??
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Anik Faisal
on 25 Jun 2018
Answered: John D'Errico
on 25 Jun 2018
Incomplete upper gamma function
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Accepted Answer
John D'Errico
on 25 Jun 2018
igamma lives in the stats toolbox. It gives you an upper tail integral.
gammainc lives in MATLAB proper. gammainc is scaled.
The two functions also swap meanings of the arguments. So be careful.
1 - igamma(5,2)/gamma(5)
ans =
0.0526530173437112
gammainc(2,5)
ans =
0.0526530173437111
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