Adds draft implementation of LR

src/optimization/mod.rs

@@ -1,12 +1,12 @@
 pub mod first_order;
 pub mod line_search;
 
-use crate::linalg::Vector;
+use crate::linalg::Matrix;
 
-type F<X: Vector> = dyn Fn(&X) -> f64;
-type DF<X: Vector> = dyn Fn(&mut X, &X);
+pub type F<'a, X: Matrix> = dyn for<'b> Fn(&'b X) -> f64 + 'a;
+pub type DF<'a, X: Matrix> = dyn for<'b> Fn(&'b mut X, &'b X) + 'a;
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 pub enum FunctionOrder {
     FIRST,
     SECOND,