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use structure::matrix::*;
use structure::dual::*;
use util::non_macro::zeros;
#[allow(non_snake_case)]
pub fn jacobian<F>(x: Vec<f64>, f: F) -> Matrix
where F: Fn(Vec<Dual>) -> Vec<Dual>
{
let l = x.len();
let x_var: Vec<Dual> = merge_dual(x.clone(), vec![1f64; l]);
let x_const = x.clone().conv_dual();
let l2 = f(x_const.clone()).len();
let mut J = zeros(l2, l);
let mut x_temp = x_const.clone();
for i in 0 .. l {
x_temp[i] = x_var[i];
let dual_temp = f(x_temp.clone());
let slope_temp = dual_temp.slopes();
for j in 0 .. l2 {
J[(j, i)] = slope_temp[j];
}
x_temp = x_const.clone();
}
J
}