# Incomplete gamma function Calculator

## Calculates the Incomplete gamma functions of the first and second kind γ(a,x) and Γ(a,x).

 a x x≧0 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit
 $\normal Incomplete\ gamma\ functions\\[10](1)\ the\ 1st\ kind\\\hspace{60}\gamma(a,x)= {\large\int_{\tiny 0}^ {\hspace{25}\small x}}t^{a-1}e^{-t}dt\\[10](2)\ the\ 2nd\ kind\\\hspace{60}\Gamma(a,x)={\large\int_{\small x}^ {\hspace{25}\tiny \infty}}t^{a-1}e^{-t}dt\\[10](3)\ \gamma(a,x)+\Gamma(a,x)=\Gamma(a)\\$
Incomplete gamma function
 [1-10] /17 Disp-Num5103050100200
[1]  2018/06/17 04:51   Female / 30 years old level / An engineer / Very /
Purpose of use
TO CHECK IF THE RESULTS FROM R ARE CORRECT
Comment/Request
VERY USEFUL AND CLEAR
[2]  2018/05/02 18:49   Male / Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
Just studying for fun
[3]  2016/06/22 14:09   Female / 20 years old level / High-school/ University/ Grad student / A little /
Purpose of use
Solve tutorial question
[4]  2015/06/24 20:34   Male / 30 years old level / An office worker / A public employee / Very /
Purpose of use
Studying for an actuarial exam.
[5]  2015/05/24 14:56   Male / 20 years old level / High-school/ University/ Grad student / Very /
Purpose of use
Homework to solve an integral
[6]  2015/02/25 04:56   Male / 60 years old level or over / A teacher / A researcher / Very /
Purpose of use
Doing a calculation at work.
[7]  2014/09/28 22:59   Male / 60 years old level or over / Self-employed people / Very /
Purpose of use
To verify my own results for function I am coding to facilitate another calculation. My results matched except for a = negative integer, but I found an error and now we match for all a and x. I also require complex a and x. Mathematica formulas at functions.wolfram.com/GammaBetaErf/Gamma2/03/01/02/ show how to compensate for branch cuts.
Comment/Request
please disregard previous suspicion of an error -- found a bug in my code.
[8]  2014/09/13 03:55   Male / 20 years old level / A teacher / A researcher / Very /
Purpose of use
Looking for how to compute the value of incomplete gamma functions.
Comment/Request
Could you please provide the relevant formula that can be used in a comptuer program to evaluate the function?
[9]  2014/05/08 20:03   Male / 20 years old level / An engineer / A little /
Purpose of use
integral
Comment/Request
source code for programming
[10]  2014/03/27 00:01   Female / 20 years old level / High-school/ University/ Grad student / A little /
Purpose of use
evaluate functions numerically

Sending completion

To improve this 'Incomplete gamma function Calculator', please fill in questionnaire.
Male or Female ?
Male Female
Age
Under 20 years old 20 years old level 30 years old level
40 years old level 50 years old level 60 years old level or over
Occupation
Elementary school/ Junior high-school student
High-school/ University/ Grad student A homemaker An office worker / A public employee
Self-employed people An engineer A teacher / A researcher
A retired person Others
Useful?
Very Useful A little Not at All
Purpose of use?