`acb_arg`

Synopsis#include <flint/acb.h>

void acb_arg(arb_t r, const acb_t z, slong prec)source

Sets r to the argument (phase) of z, $\operatorname{atan2}(b, a)$ for $z = a + bi$ , with values in $(-\pi, \pi]$ and the branch cut on $(-\infty, 0]$ : $\arg(0) = 0$ and $\arg(a) = \pi$ for $a < 0$ . A rectangle that crosses the negative real axis gives an enclosure of $[-\pi, \pi]$ .

Guides#

Getting started with acb

Cite this page

The FLINT team, “acb_arg (acb.h),” FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev, 2026. https://flintlib.org/doc/acb/acb_arg.html (generated 2026-11-02).

@misc{flint-doc-acb-acb-arg,
  author       = {{The FLINT team}},
  title        = {{acb\_arg (acb.h)}},
  howpublished = {FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev},
  year         = {2026},
  url          = {https://flintlib.org/doc/acb/acb_arg.html},
  note         = {Generated 2026-11-02}
}

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