the scipy.special.gammainc can not take negative values for the first argument. Are there any other implementations that could in python? I can do a manual integration for sure but I'd like to know if there are good alternatives that already exist.

Correct result: 1 - Gamma[-1,1] = 0.85

Use Scipy: scipy.special.gammainc(-1, 1) = 0

Thanks.

python scipy
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