rust_linear_algebra/vector/
norm.rs

1use super::Vector;
2use std::ops::Mul;
3
4impl<K> Vector<K>
5where
6    K: Mul<f32, Output = K> + Into<f32> + Copy + Default,
7{
8    pub fn norm_1(&self) -> f32 {
9        self.iter().fold(0.0, |acc, &x| {
10            let x_f32: f32 = x.into();
11            if x_f32 < 0.0 {
12                acc + (-x_f32)
13            } else {
14                acc + x_f32
15            }
16        })
17    }
18    pub fn norm(&self) -> f32 {
19        let sum_of_squares: f32 = self.elements.iter().fold(0.0, |acc, &x| {
20            let x_f32: f32 = x.into();
21            acc + x_f32.powi(2)
22        });
23        sum_of_squares.sqrt()
24    }
25    pub fn norm_inf(&self) -> f32 {
26        self.elements.iter().fold(0.0, |acc, &x| {
27            let x_f32: f32 = x.into();
28            acc.max(x_f32.abs())
29        })
30    }
31}