Module gmp_mpfr_sys::mpfr
source · Expand description
Function and type bindings for the MPFR library.
Examples
use gmp_mpfr_sys::mpfr;
use std::mem;
let one_third = 1.0_f64 / 3.0;
unsafe {
let mut f = mem::uninitialized();
mpfr::init2(&mut f, 53);
let dir = mpfr::set_d(&mut f, one_third, mpfr::rnd_t::RNDN);
assert_eq!(dir, 0);
let d = mpfr::get_d(&f, mpfr::rnd_t::RNDN);
assert_eq!(d, one_third);
mpfr::clear(&mut f);
}The following example is a translation of the MPFR sample found on the MPFR website. The program computes a lower bound on 1 + 1/1! + 1/2! + … + 1/100! using 200-bit precision. The program writes:
Sum is 2.7182818284590452353602874713526624977572470936999595749669131
use gmp_mpfr_sys::mpfr::{self, mpfr_t, rnd_t};
use std::ffi::CStr;
use std::fmt::Write;
use std::mem;
use std::os::raw::c_int;
use std::ptr;
fn main() {
unsafe {
let mut s = mem::uninitialized();
let mut t = mem::uninitialized();
let mut u = mem::uninitialized();
mpfr::init2(&mut t, 200);
mpfr::set_d(&mut t, 1.0, rnd_t::RNDD);
mpfr::init2(&mut s, 200);
mpfr::set_d(&mut s, 1.0, rnd_t::RNDD);
mpfr::init2(&mut u, 200);
for i in 1..101 {
mpfr::mul_ui(&mut t, &t, i, rnd_t::RNDU);
mpfr::set_d(&mut u, 1.0, rnd_t::RNDD);
mpfr::div(&mut u, &u, &t, rnd_t::RNDD);
mpfr::add(&mut s, &s, &u, rnd_t::RNDD);
}
let sr = mpfr_to_string(10, 0, &s, rnd_t::RNDD);
println!("Sum is {}", sr);
mpfr::clear(&mut s);
mpfr::clear(&mut t);
mpfr::clear(&mut u);
}
}
unsafe fn mpfr_to_string(
base: c_int, n: usize, op: *const mpfr_t, rnd: rnd_t
) -> String {
let mut exp = mem::uninitialized();
let str = mpfr::get_str(ptr::null_mut(), &mut exp, base, n, op, rnd);
let mut buf = CStr::from_ptr(str).to_string_lossy().into_owned();
mpfr::free_str(str);
if mpfr::regular_p(op) != 0 {
let idx = if buf.starts_with("-") { 2 } else { 1 };
buf.insert(idx, '.');
if exp != 1 {
buf.push(if base <= 10 { 'e' } else { '@' });
write!(buf, "{}", exp - 1).unwrap();
}
}
buf
}Structs
Enums
See:
mpfr_rnd_tConstants
See:
MPFR_VERSIONFunctions
See:
mpfr_acoshSee:
mpfr_add_dSee:
mpfr_add_qSee:
mpfr_add_siSee:
mpfr_add_uiSee:
mpfr_add_zSee:
mpfr_asinhSee:
mpfr_asprintfSee:
mpfr_atan2See:
mpfr_atanhSee:
mpfr_can_roundSee:
mpfr_clearSee:
mpfr_clearsSee:
mpfr_cmp_dSee:
mpfr_cmp_fSee:
mpfr_cmp_qSee:
mpfr_cmp_siSee:
mpfr_cmp_uiSee:
mpfr_cmp_zSee:
mpfr_cmpabsSee:
mpfr_const_piSee:
mpfr_copysignSee:
mpfr_d_divSee:
mpfr_d_subSee:
mpfr_digammaSee:
mpfr_div_2expSee:
mpfr_div_2siSee:
mpfr_div_2uiSee:
mpfr_div_dSee:
mpfr_div_qSee:
mpfr_div_siSee:
mpfr_div_uiSee:
mpfr_div_zSee:
mpfr_divby0_pSee:
mpfr_equal_pSee:
mpfr_erandomSee:
mpfr_exp10See:
mpfr_expm1See:
mpfr_fac_uiSee:
mpfr_flags_setSee:
mpfr_floorSee:
mpfr_fmodquoSee:
mpfr_fprintfSee:
mpfr_free_strSee:
mpfr_frexpSee:
mpfr_gammaSee:
mpfr_gamma_incSee:
mpfr_get_dSee:
mpfr_get_emaxSee:
mpfr_get_eminSee:
mpfr_get_expSee:
mpfr_get_fSee:
mpfr_get_fltSee:
mpfr_get_precSee:
mpfr_get_qSee:
mpfr_get_siSee:
mpfr_get_sjSee:
mpfr_get_strSee:
mpfr_get_uiSee:
mpfr_get_ujSee:
mpfr_get_zgrandom⚠Deprecated
See:
mpfr_grandomSee:
mpfr_greater_pSee:
mpfr_hypotSee:
mpfr_inf_pSee:
mpfr_init2See:
mpfr_init_setSee:
mpfr_initsSee:
mpfr_inits2See:
mpfr_inp_strSee:
mpfr_integer_pSee:
mpfr_less_pSee:
mpfr_lgammaSee:
mpfr_lngammaSee:
mpfr_log1pSee:
mpfr_log10See:
mpfr_log_uiSee:
mpfr_min_precSee:
mpfr_mul_2expSee:
mpfr_mul_2siSee:
mpfr_mul_2uiSee:
mpfr_mul_dSee:
mpfr_mul_qSee:
mpfr_mul_siSee:
mpfr_mul_uiSee:
mpfr_mul_zSee:
mpfr_nan_pSee:
mpfr_nanflag_pSee:
mpfr_nextaboveSee:
mpfr_nextbelowSee:
mpfr_nrandomSee:
mpfr_number_pSee:
mpfr_out_strSee:
mpfr_pow_siSee:
mpfr_pow_uiSee:
mpfr_pow_zSee:
mpfr_printfSee:
mpfr_rec_sqrtSee:
mpfr_regular_pSee:
mpfr_reldiffSee:
mpfr_remainderSee:
mpfr_remquoSee:
mpfr_rint_ceilSee:
mpfr_rootn_uiSee:
mpfr_roundSee:
mpfr_roundevenSee:
mpfr_set_dSee:
mpfr_set_emaxSee:
mpfr_set_eminSee:
mpfr_set_expSee:
mpfr_set_fSee:
mpfr_set_fltSee:
mpfr_set_infSee:
mpfr_set_nanSee:
mpfr_set_precSee:
mpfr_set_qSee:
mpfr_set_siSee:
mpfr_set_sjSee:
mpfr_set_strSee:
mpfr_set_uiSee:
mpfr_set_ujSee:
mpfr_set_zSee:
mpfr_set_zeroSee:
mpfr_setsignSee:
mpfr_si_divSee:
mpfr_si_subSee:
mpfr_signbitSee:
mpfr_sin_cosSee:
mpfr_sinh_coshSee:
mpfr_snprintfSee:
mpfr_sprintfsqrt⚠
See:
mpfr_rec_sqrtSee:
mpfr_sqrt_uiSee:
mpfr_strtofrSee:
mpfr_sub_dSee:
mpfr_sub_qSee:
mpfr_sub_siSee:
mpfr_sub_uiSee:
mpfr_sub_zSee:
mpfr_truncSee:
mpfr_ui_divSee:
mpfr_ui_powSee:
mpfr_ui_pow_uiSee:
mpfr_ui_subSee:
mpfr_urandomSee:
mpfr_urandombSee:
mpfr_z_subSee:
mpfr_zero_pSee:
mpfr_zeta_ui