Small library providing Theta-functions.
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README.md

theta-functions

Implementation of theta-functions using trigonometric series.

They're the special functions of two variables. Described very well at Wikipedia article.

Library exports four theta-functions and a small helper to calculate their second parameter.

Theta functions are functions of Complex variables, FYI.

Interface summary

thetaN n q u

where N is a number from 1 to 4, n is a quantization factor, q is a theta-functions special parameter, and u is an actual argument of function.

Parameter q should be calculated with the helper function qpar, which accepts real numbers as argument:

qpar tau

qpar itself returns Complex value. This helper is used to draw the library closer to the definition of theta-functions provided in the books.

Constraints

Never call theta1..4 with u > pi. Theta-functions are raising very rapidly (maybe it's because of trigonometric series representing them), so with large values of argument they overflow badly and return incorrect results.