rustnomial

This crate provides utilities for operating on polynomials, including:

• Parsing polynomials from strings, and creating strings from polynomials
• Math operations with polynomials
• Integration and derivation of polynomials
• Finding polynomial roots

Examples

• Parsing polynomials from / to strings:

use std::str::FromStr;

use rustnomial::{GenericPolynomial, Polynomial};

fn main() {
    let poly = Polynomial::<i32>::from_str("1+x^2-3+11x").unwrap();
    // x^2 + 11x - 2
    println!("{}", poly);
}

• Integration

use rustnomial::integral;

fn main() {
    let poly = integral!(5., 2., 0.);
    // 1.6666666666666667x^3 + x^2 + C
    println!("{}", poly);
    // 2.666666666666667
    println!("{}", poly.eval(0., 1.));
}

• Derivation

use rustnomial::derivative;

fn main() {
    let poly = derivative!(5., 2., 0.);
    // 10x + 2
    println!("{}", poly);
}

• Rootfinding

use rustnomial::{GenericPolynomial, Polynomial};

fn main() {
    let poly = Polynomial::<f64>::new(vec![1., 2.]).pow(9) * Polynomial::new(vec![1., 3.]);
    // ManyRealRoots([-3.0, -2.0, -2.0, -2.0, -2.0, -2.0, -2.0, -2.0, -2.0, -2.0])
    println!("{:?}", poly.roots());
}