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// Copyright © 2026 Mikhail Hogrefe
//
// This file is part of Malachite.
//
// Malachite is free software: you can redistribute it and/or modify it under the terms of the GNU
// Lesser General Public License (LGPL) as published by the Free Software Foundation; either version
// 3 of the License, or (at your option) any later version. See <https://www.gnu.org/licenses/>.
use crate::rational_vector::RationalVector;
use core::ops::{Sub, SubAssign};
fn assert_same_dimension(v: &RationalVector, w: &RationalVector) {
assert_eq!(
v.elements.len(),
w.elements.len(),
"cannot subtract vectors of different dimensions"
);
}
impl Sub<Self> for RationalVector {
type Output = Self;
/// Subtracts two [`RationalVector`]s, taking both by value.
///
/// The difference is taken element by element, so the result has the same dimension as the
/// operands.
///
/// $$
/// f(v, w) = v - w.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements of both vectors.
///
/// # Panics
/// Panics if `self` and `other` have different dimensions.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_q::rational_vector::RationalVector;
///
/// let v = RationalVector::from_str("(1/2, -2, 3)").unwrap();
/// let w = RationalVector::from_str("(1/3, 5, -3)").unwrap();
/// assert_eq!((v - w).to_string(), "(1/6, -7, 6)");
/// ```
#[inline]
fn sub(mut self, other: Self) -> Self {
self -= other;
self
}
}
impl Sub<&Self> for RationalVector {
type Output = Self;
/// Subtracts two [`RationalVector`]s, taking the first by value and the second by reference.
///
/// The difference is taken element by element, so the result has the same dimension as the
/// operands.
///
/// $$
/// f(v, w) = v - w.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements of both vectors.
///
/// # Panics
/// Panics if `self` and `other` have different dimensions.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_q::rational_vector::RationalVector;
///
/// let v = RationalVector::from_str("(1/2, -2, 3)").unwrap();
/// let w = RationalVector::from_str("(1/3, 5, -3)").unwrap();
/// assert_eq!((v - &w).to_string(), "(1/6, -7, 6)");
/// ```
#[inline]
fn sub(mut self, other: &Self) -> Self {
self -= other;
self
}
}
impl Sub<RationalVector> for &RationalVector {
type Output = RationalVector;
/// Subtracts two [`RationalVector`]s, taking the first by reference and the second by value.
///
/// The difference is taken element by element, so the result has the same dimension as the
/// operands.
///
/// $$
/// f(v, w) = v - w.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements of both vectors.
///
/// # Panics
/// Panics if `self` and `other` have different dimensions.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_q::rational_vector::RationalVector;
///
/// let v = RationalVector::from_str("(1/2, -2, 3)").unwrap();
/// let w = RationalVector::from_str("(1/3, 5, -3)").unwrap();
/// assert_eq!((&v - w).to_string(), "(1/6, -7, 6)");
/// ```
#[inline]
fn sub(self, mut other: RationalVector) -> RationalVector {
other -= self;
-other
}
}
impl Sub<&RationalVector> for &RationalVector {
type Output = RationalVector;
/// Subtracts two [`RationalVector`]s, taking both by reference.
///
/// The difference is taken element by element, so the result has the same dimension as the
/// operands.
///
/// $$
/// f(v, w) = v - w.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements of both vectors.
///
/// # Panics
/// Panics if `self` and `other` have different dimensions.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_q::rational_vector::RationalVector;
///
/// let v = RationalVector::from_str("(1/2, -2, 3)").unwrap();
/// let w = RationalVector::from_str("(1/3, 5, -3)").unwrap();
/// assert_eq!((&v - &w).to_string(), "(1/6, -7, 6)");
/// ```
fn sub(self, other: &RationalVector) -> RationalVector {
assert_same_dimension(self, other);
RationalVector {
elements: self
.elements
.iter()
.zip(&other.elements)
.map(|(x, y)| x - y)
.collect(),
}
}
}
impl SubAssign<Self> for RationalVector {
/// Subtracts a [`RationalVector`] from a [`RationalVector`] in place, taking the
/// [`RationalVector`] on the right-hand side by value.
///
/// The difference is taken element by element, so the result has the same dimension as the
/// operands.
///
/// $$
/// f(v, w) = v - w.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements of both vectors.
///
/// # Panics
/// Panics if `self` and `other` have different dimensions.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_q::rational_vector::RationalVector;
///
/// let mut v = RationalVector::from_str("(1/2, -2, 3)").unwrap();
/// v -= RationalVector::from_str("(1/3, 5, -3)").unwrap();
/// assert_eq!(v.to_string(), "(1/6, -7, 6)");
/// ```
fn sub_assign(&mut self, other: Self) {
assert_same_dimension(self, &other);
for (x, y) in self.elements.iter_mut().zip(other.elements) {
*x -= y;
}
}
}
impl SubAssign<&Self> for RationalVector {
/// Subtracts a [`RationalVector`] from a [`RationalVector`] in place, taking the
/// [`RationalVector`] on the right-hand side by reference.
///
/// The difference is taken element by element, so the result has the same dimension as the
/// operands.
///
/// $$
/// f(v, w) = v - w.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements of both vectors.
///
/// # Panics
/// Panics if `self` and `other` have different dimensions.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_q::rational_vector::RationalVector;
///
/// let mut v = RationalVector::from_str("(1/2, -2, 3)").unwrap();
/// v -= &RationalVector::from_str("(1/3, 5, -3)").unwrap();
/// assert_eq!(v.to_string(), "(1/6, -7, 6)");
/// ```
fn sub_assign(&mut self, other: &Self) {
assert_same_dimension(self, other);
for (x, y) in self.elements.iter_mut().zip(&other.elements) {
*x -= y;
}
}
}