Jcd Jcd_sub Jcn Jcn_sub Jcs Jcs_sub Jdc Jdc_sub Jdn Jdn_sub Jds Jds_sub Jelli Jnc Jnc_sub Jnd Jnd_sub Jns Jns_sub Jsc Jsc_sub Jsd Jsd_sub Jsn Jsn_sub Jtheta1 Jtheta1_sub Jtheta1t Jtheta1t_sub Jtheta2 Jtheta2_sub Jtheta2t Jtheta2t_sub Jtheta3 Jtheta3_sub Jtheta3m1 Jtheta3m1_sub Jtheta3m1t Jtheta3m1t_sub Jtheta3t Jtheta3t_sub Jtheta4 Jtheta4_sub Jtheta4m1 Jtheta4m1_sub Jtheta4m1t Jtheta4m1t_sub Jtheta4t Jtheta4t_sub

Jtheta4() Function Jtheta4 ( X As  Double, Q As  Double, Optional Info As  Long  ) Jacobi theta function θ4(x, q) Purpose Computes the Jacobi theta function θ4. θ4(x, q) = 1 + 2Σ(-1)^n q^(n^2) cos(2nx) (Σ for n = 1 to ∞) Returns Double Jacobi theta function θ4(x, q). Parameters [in] X Argument x. [in] Q Argument q. (0 < Q < 1) [out] Info (Optional) = 0: Successful exit. = -2: The argument Q had an illegal value. (Q <= 0 or Q >= 1) = 1: Floating point range error. Reference boost/math/special_functions