32 lines
801 B
Rust
32 lines
801 B
Rust
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mod univariate_solvers;
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/// x sin(x)
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/// e + ──────
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/// x
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fn fct(x : f64) -> f64 {
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if x != 0.0 {
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return f64::sin(x)/x + f64::exp(x);
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} else {
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return 2.0;
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}
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}
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fn dfct(x : f64) -> f64 {
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if x != 0.0 {
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return f64::exp(x) + f64::cos(x)/x - f64::sin(x)/x.powi(2);
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} else {
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return 1.0;
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}
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}
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fn main() {
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println!("Testing Rust numerical solvers.");
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let x0 : f64 = 1.0;
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let tol : f64 = 1e-10;
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let max_iter : u32 = 100;
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let x_mathematica = -3.26650043678562449167148755288;
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let x_newton = univariate_solvers::newton_solve(&(fct as fn(f64) -> f64), &(dfct as fn(f64) -> f64), x0, tol, max_iter);
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println!("Mathematica : x = {}", x_mathematica);
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println!("Newton's method : x = {}", x_newton);
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}
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