Crate num

A collection of numeric types and traits for Rust.

This includes new types for big integers, rationals, and complex numbers, new traits for generic programming on numeric properties like Integer, and generic range iterators.

Example

This example uses the BigRational type and Newton's method to approximate a square root to arbitrary precision:

extern crate num; #[cfg(all(feature = "bigint", feature="rational"))] mod test { use num::FromPrimitive; use num::bigint::BigInt; use num::rational::{Ratio, BigRational}; pub fn approx_sqrt(number: u64, iterations: usize) -> BigRational { let start: Ratio<BigInt> = Ratio::from_integer(FromPrimitive::from_u64(number).unwrap()); let mut approx = start.clone(); for _ in 0..iterations { approx = (&approx + (&start / &approx)) / Ratio::from_integer(FromPrimitive::from_u64(2).unwrap()); } approx } } #[cfg(not(all(feature = "bigint", feature="rational")))] mod test { pub fn approx_sqrt(n: u64, _: usize) -> u64 { n } } use test::approx_sqrt; fn main() { println!("{}", approx_sqrt(10, 4)); // prints 4057691201/1283082416 }

extern crate num;

use num::FromPrimitive;
use num::bigint::BigInt;
use num::rational::{Ratio, BigRational};

fn approx_sqrt(number: u64, iterations: usize) -> BigRational {
    let start: Ratio<BigInt> = Ratio::from_integer(FromPrimitive::from_u64(number).unwrap());
    let mut approx = start.clone();

    for _ in 0..iterations {
        approx = (&approx + (&start / &approx)) /
            Ratio::from_integer(FromPrimitive::from_u64(2).unwrap());
    }

    approx
}

fn main() {
    println!("{}", approx_sqrt(10, 4)); // prints 4057691201/1283082416
}

Reexports

pub use bigint::{BigInt, BigUint};

pub use rational::Rational;

pub use rational::BigRational;

pub use complex::Complex;

pub use integer::Integer;

pub use iter::{range, range_inclusive, range_step, range_step_inclusive};

pub use traits::{Num, Zero, One, Signed, Unsigned, Bounded, Saturating, CheckedAdd, CheckedSub, CheckedMul, CheckedDiv, PrimInt, Float, ToPrimitive, FromPrimitive, NumCast, cast};

Modules

bigint	A Big integer (signed version: BigInt, unsigned version: BigUint).
complex	Complex numbers.
integer	Integer trait and functions.
iter	External iterators for generic mathematics
rational	Rational numbers
traits	Numeric traits for generic mathematics

Functions

abs	Computes the absolute value.
abs_sub	The positive difference of two numbers.
one	Returns the multiplicative identity, 1.
pow	Raises a value to the power of exp, using exponentiation by squaring.
signum	Returns the sign of the number.
zero	Returns the additive identity, 0.