SciPy

scipy.special.modfresnelm

scipy.special.modfresnelm(x) = <ufunc 'modfresnelm'>

Modified Fresnel negative integrals

Returns :

fm :

Integral F_-(x): integral(exp(-1j*t*t),t=x..inf)

km :

Integral K_-(x): 1/sqrt(pi)*exp(1j*(x*x+pi/4))*fp