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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
Anik Faisal il 25 Giu 2018
Risposto: John D'Errico il 25 Giu 2018
Incomplete upper gamma function

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John D'Errico
John D'Errico il 25 Giu 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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