Function: theta
Section: transcendental
C-Name: theta
Prototype: GGp
Help: theta(q,z): Jacobi sine theta-function.
Doc: Jacobi sine theta-function
 $$ \theta_{1}(z, q) =
    2q^{1/4} \sum_{n\geq 0} (-1)^{n} q^{n(n+1)} \sin((2n+1)z).$$
