jerome/rust-numerical-solvers
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Ok fixed now

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Jérôme 2023-03-25 23:04:48 +01:00
parent 59c27b110d
commit f89389b4c2
2 changed files with 14 additions and 5 deletions
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7
src/main.rs
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@ -24,8 +24,11 @@ fn main() {
let x0 : f64 = 1.0;
let tol : f64 = 1e-10;
let max_iter : u32 = 100;
let dx_num : f64 = 1e-6;
let x_mathematica = -3.26650043678562449167148755288;
let x_newton = univariate_solvers::newton_solve(&(fct as fn(f64) -> f64), &(dfct as fn(f64) -> f64), x0, tol, max_iter);
println!("Mathematica : x = {}", x_mathematica);
println!("Newton's method : x = {}", x_newton);
let x_newton_num: f64 = univariate_solvers::newton_solve_num(&(fct as fn(f64) -> f64), x0, tol, dx_num, max_iter);
println!("Mathematica : x = {}", x_mathematica);
println!("Newton's method : x = {}", x_newton);
println!("Newton's method (num) : x = {}", x_newton_num);
}

12
src/univariate_solvers.rs
View file

@ -5,7 +5,9 @@
/// @param tol tolerance
/// @param max_iter maximum number of iterations
/// @return solution
pub fn newton_solve<F: Fn(f64) -> f64, F2: Fn(f64) -> f64>(f : &F, df : &F2, x0 : f64, tol : f64, max_iter : u32) -> f64 {
pub fn newton_solve<F, F2>(f : F, df : F2, x0 : f64, tol : f64, max_iter : u32) -> f64
where F : Fn(f64) -> f64, F2 : Fn(f64) -> f64
{
let mut x: f64 = x0;
let mut dx: f64;
let mut fx: f64;
@ -33,7 +35,11 @@ pub fn newton_solve<F: Fn(f64) -> f64, F2: Fn(f64) -> f64>(f : &F, df : &F2, x0
/// @param tol tolerance
/// @param max_iter maximum number of iterations
/// @return solution
pub fn newton_solve_num<F: Fn(f64) -> f64>(f : &F, x0 : f64, tol : f64, dx_num : f64, max_iter : u32) -> f64 {
return newton_solve(f, &((|x: f64| (f(x + dx_num) - f(x - dx_num))/(2.0*dx_num)) as fn(f64) -> f64), x0, tol, max_iter);
pub fn newton_solve_num<F>(f : F, x0 : f64, tol : f64, dx_num : f64, max_iter : u32) -> f64
where F : Fn(f64) -> f64
{
return newton_solve(&f, |x: f64| {
(f(x + dx_num) - f(x - dx_num))/(2.0*dx_num)
}, x0, tol, max_iter);
}