jcd jcn jcs jdc jdn jds jelli jnc jnd jns jsc jsd jsn jtheta1 jtheta1t jtheta2 jtheta2t jtheta3 jtheta3m1 jtheta3m1t jtheta3t jtheta4 jtheta4m1 jtheta4m1t jtheta4t

jtheta4() double jtheta4 ( double  x, double  q  ) Jacobi theta function θ4(x, q) Purpose This function computes the Jacobi theta function θ4. θ4(x, q) = 1 + 2Σ(-1)^n q^(n^2) cos(2nx) (Σ for n = 1 to ∞) Returns Jacobi theta function θ4(x, q). Parameters [in] x Argument x. [in] q Argument q. (0 < q < 1) Error handling If q <= 0 or q >= 1, domain error (EDOM) occurs. Range error (ERANGE) may be reported. Reference boost/math/special_functions