acb_theta_sum_worker_t

For a line with fixed $n_1, \ldots, n_{g-1}$ and $n_{\min} \le n_0 \le n_{\max}$, the arguments are: the output th to which the terms are added; $v_1 = (e^{\pi i j^2 \tau_{0,0}})_j$ and $v_2 = (x^j)_j$ for $n_{\min} \le j \le n_{\max}$ with $x = e^{2\pi i z_0} \prod_{k \ge 1} e^{2\pi i n_k \tau_{0,k}}$; the cofactor $c = \prod_{k \ge 1} e^{2\pi i n_k z_k} \prod_{1\leq j\leq k < g} e^{\pi i (2 - \delta_{j,k}) n_j n_k \tau_{j,k}}$; the working precision of each term in precs; the common length len $= n_{\max} - n_{\min} + 1$ of v1, v2 and precs; coords $= (n_{\min}, n_1, \ldots, n_{g-1})$; the derivation order ord; the precision prec of the line and fullprec for the sum. This lets the worker use acb_dot, with fewer than two complex multiplications per lattice point on average and with lower precision for points far from the center.