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/*
Copyright (C) 2024 Jean Kieffer
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "arb.h"
#include "arb_mat.h"
#include "acb_mat.h"
#include "acb_theta.h"
void
acb_siegel_cho_yinv(arb_mat_t cho, arb_mat_t yinv, const acb_mat_t tau, slong prec)
{
arb_t sqrtpi;
int res;
arb_init(sqrtpi);
arb_const_sqrt_pi(sqrtpi, prec);
acb_mat_get_imag(cho, tau);
res = arb_mat_cho(cho, cho, prec);
if (!res)
{
/* Should not happen in tests */
arb_mat_indeterminate(cho);
}
arb_mat_inv_cho_precomp(yinv, cho, prec);
arb_mat_transpose(cho, cho);
arb_mat_scalar_mul_arb(cho, cho, sqrtpi, prec);
arb_clear(sqrtpi);
}