The Si(x)-function (integral of the sine) in Python requires the usage of the *scipy*-package!

Usage:

import scipy from scipy.special import* (si,ci) = sici(X)

Now *si* and *ci* hold the results of the sine / cosine integral.

*Make sure not to confuse the Si(x)-function with si(x) = sin(x)/x = sinc(x), the cardinal sine function. Especially German literatur often uses the expression si(x) instead of sinc(x).*