`mp_real_set_trunc`

Synopsis#include <flint/mp_real.h>

void mp_real_set_trunc(mp_real_t res, const mp_real_t x, slong n)source

Set res to $x$ rounded to its top $n \ge 1$ limbs (a copy if $x$ has at most $n$ limbs). res may alias $x$ .

The dropped tail and the old radius are each below one ulp of the new last limb, so the new radius is $[\mathrm{tail} \ne 0] + [\mathrm{radius} \ne 0]$ ulps. The result is exact if nothing nonzero is dropped from an exact input.

Cite this page

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

@misc{flint-doc-mp-real-mp-real-set-trunc,
  author       = {{The FLINT team}},
  title        = {{mp\_real\_set\_trunc (mp\_real.h)}},
  howpublished = {FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev},
  year         = {2026},
  url          = {https://flintlib.org/doc/mp_real/mp_real_set_trunc.html},
  note         = {Generated 2026-11-02}
}

Edit this page · PDF version · Built with fdoc from 0a4634bf95