`qqbar_csgn`

Synopsis#include <flint/qqbar.h>

int qqbar_csgn(const qqbar_t x)source

Returns the extension of the real sign function that is 1 in the open right half-plane, $-1$ in the open left half-plane, the sign of the imaginary part on the imaginary axis, and 0 at 0; equivalently $\operatorname{csgn}(x) = x / \sqrt{x^2}$ for $x \ne 0$ .

Cite this page

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

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

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