SciPy

scipy.special.gdtr

scipy.special.gdtr(a, b, x) = <ufunc 'gdtr'>

Gamma distribution cumulative density function.

Returns the integral from zero to x of the gamma probability density function:

a**b / gamma(b) * integral(t**(b-1) exp(-at),t=0..x).

The arguments a and b are used differently here than in other definitions.

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