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// src/comparisons_broadcast.rs
//! Comparison operators with automatic broadcasting
//!
//! This module implements comparison operators (<, <=, >, >=, ==, !=) for Array
//! with automatic broadcasting support.
use crate::array::Array;
use crate::error::Result;
use std::cmp::PartialOrd;
impl<T> Array<T>
where
T: Clone + PartialOrd,
{
/// Element-wise less than with broadcasting
///
/// # Examples
///
/// ```
/// use numrs2::prelude::*;
/// use numrs2::error::Result;
///
/// fn main() -> Result<()> {
/// let a = Array::from_vec(vec![1.0, 2.0, 3.0]);
/// let b = Array::from_vec(vec![2.0, 2.0, 2.0]);
/// let result = a.less_than(&b)?;
/// assert_eq!(result.to_vec(), vec![true, false, false]);
/// Ok(())
/// }
/// ```
pub fn less_than(&self, other: &Array<T>) -> Result<Array<bool>> {
self.broadcast_op(other, |a, b| {
let a_vec = a.to_vec();
let b_vec = b.to_vec();
let result: Vec<bool> = a_vec.iter().zip(b_vec.iter()).map(|(x, y)| x < y).collect();
Array::from_vec(result).reshape(&a.shape())
})
}
/// Element-wise less than or equal with broadcasting
///
/// # Examples
///
/// ```
/// use numrs2::prelude::*;
/// use numrs2::error::Result;
///
/// fn main() -> Result<()> {
/// let a = Array::from_vec(vec![1.0, 2.0, 3.0]);
/// let b = Array::from_vec(vec![2.0, 2.0, 2.0]);
/// let result = a.less_equal(&b)?;
/// assert_eq!(result.to_vec(), vec![true, true, false]);
/// Ok(())
/// }
/// ```
pub fn less_equal(&self, other: &Array<T>) -> Result<Array<bool>> {
self.broadcast_op(other, |a, b| {
let a_vec = a.to_vec();
let b_vec = b.to_vec();
let result: Vec<bool> = a_vec
.iter()
.zip(b_vec.iter())
.map(|(x, y)| x <= y)
.collect();
Array::from_vec(result).reshape(&a.shape())
})
}
/// Element-wise greater than with broadcasting
///
/// # Examples
///
/// ```
/// use numrs2::prelude::*;
/// use numrs2::error::Result;
///
/// fn main() -> Result<()> {
/// let a = Array::from_vec(vec![1.0, 2.0, 3.0]);
/// let b = Array::from_vec(vec![2.0, 2.0, 2.0]);
/// let result = a.greater_than(&b)?;
/// assert_eq!(result.to_vec(), vec![false, false, true]);
/// Ok(())
/// }
/// ```
pub fn greater_than(&self, other: &Array<T>) -> Result<Array<bool>> {
self.broadcast_op(other, |a, b| {
let a_vec = a.to_vec();
let b_vec = b.to_vec();
let result: Vec<bool> = a_vec.iter().zip(b_vec.iter()).map(|(x, y)| x > y).collect();
Array::from_vec(result).reshape(&a.shape())
})
}
/// Element-wise greater than or equal with broadcasting
///
/// # Examples
///
/// ```
/// use numrs2::prelude::*;
/// use numrs2::error::Result;
///
/// fn main() -> Result<()> {
/// let a = Array::from_vec(vec![1.0, 2.0, 3.0]);
/// let b = Array::from_vec(vec![2.0, 2.0, 2.0]);
/// let result = a.greater_equal(&b)?;
/// assert_eq!(result.to_vec(), vec![false, true, true]);
/// Ok(())
/// }
/// ```
pub fn greater_equal(&self, other: &Array<T>) -> Result<Array<bool>> {
self.broadcast_op(other, |a, b| {
let a_vec = a.to_vec();
let b_vec = b.to_vec();
let result: Vec<bool> = a_vec
.iter()
.zip(b_vec.iter())
.map(|(x, y)| x >= y)
.collect();
Array::from_vec(result).reshape(&a.shape())
})
}
}
impl<T> Array<T>
where
T: Clone + PartialEq,
{
/// Element-wise equality with broadcasting
///
/// # Examples
///
/// ```
/// use numrs2::prelude::*;
/// use numrs2::error::Result;
///
/// fn main() -> Result<()> {
/// let a = Array::from_vec(vec![1.0, 2.0, 3.0]);
/// let b = Array::from_vec(vec![2.0, 2.0, 2.0]);
/// let result = a.equal(&b)?;
/// assert_eq!(result.to_vec(), vec![false, true, false]);
/// Ok(())
/// }
/// ```
pub fn equal(&self, other: &Array<T>) -> Result<Array<bool>> {
self.broadcast_op(other, |a, b| {
let a_vec = a.to_vec();
let b_vec = b.to_vec();
let result: Vec<bool> = a_vec
.iter()
.zip(b_vec.iter())
.map(|(x, y)| x == y)
.collect();
Array::from_vec(result).reshape(&a.shape())
})
}
/// Element-wise inequality with broadcasting
///
/// # Examples
///
/// ```
/// use numrs2::prelude::*;
/// use numrs2::error::Result;
///
/// fn main() -> Result<()> {
/// let a = Array::from_vec(vec![1.0, 2.0, 3.0]);
/// let b = Array::from_vec(vec![2.0, 2.0, 2.0]);
/// let result = a.not_equal(&b)?;
/// assert_eq!(result.to_vec(), vec![true, false, true]);
/// Ok(())
/// }
/// ```
pub fn not_equal(&self, other: &Array<T>) -> Result<Array<bool>> {
self.broadcast_op(other, |a, b| {
let a_vec = a.to_vec();
let b_vec = b.to_vec();
let result: Vec<bool> = a_vec
.iter()
.zip(b_vec.iter())
.map(|(x, y)| x != y)
.collect();
Array::from_vec(result).reshape(&a.shape())
})
}
}
// Logical operations for boolean arrays
impl Array<bool> {
/// Element-wise logical AND with broadcasting
///
/// # Examples
///
/// ```
/// use numrs2::prelude::*;
/// use numrs2::error::Result;
///
/// fn main() -> Result<()> {
/// let a = Array::from_vec(vec![true, true, false, false]);
/// let b = Array::from_vec(vec![true, false, true, false]);
/// let result = a.logical_and(&b)?;
/// assert_eq!(result.to_vec(), vec![true, false, false, false]);
/// Ok(())
/// }
/// ```
pub fn logical_and(&self, other: &Array<bool>) -> Result<Array<bool>> {
self.broadcast_op(other, |a, b| {
let a_vec = a.to_vec();
let b_vec = b.to_vec();
let result: Vec<bool> = a_vec
.iter()
.zip(b_vec.iter())
.map(|(x, y)| *x && *y)
.collect();
Array::from_vec(result).reshape(&a.shape())
})
}
/// Element-wise logical OR with broadcasting
///
/// # Examples
///
/// ```
/// use numrs2::prelude::*;
/// use numrs2::error::Result;
///
/// fn main() -> Result<()> {
/// let a = Array::from_vec(vec![true, true, false, false]);
/// let b = Array::from_vec(vec![true, false, true, false]);
/// let result = a.logical_or(&b)?;
/// assert_eq!(result.to_vec(), vec![true, true, true, false]);
/// Ok(())
/// }
/// ```
pub fn logical_or(&self, other: &Array<bool>) -> Result<Array<bool>> {
self.broadcast_op(other, |a, b| {
let a_vec = a.to_vec();
let b_vec = b.to_vec();
let result: Vec<bool> = a_vec
.iter()
.zip(b_vec.iter())
.map(|(x, y)| *x || *y)
.collect();
Array::from_vec(result).reshape(&a.shape())
})
}
/// Element-wise logical XOR with broadcasting
///
/// # Examples
///
/// ```
/// use numrs2::prelude::*;
/// use numrs2::error::Result;
///
/// fn main() -> Result<()> {
/// let a = Array::from_vec(vec![true, true, false, false]);
/// let b = Array::from_vec(vec![true, false, true, false]);
/// let result = a.logical_xor(&b)?;
/// assert_eq!(result.to_vec(), vec![false, true, true, false]);
/// Ok(())
/// }
/// ```
pub fn logical_xor(&self, other: &Array<bool>) -> Result<Array<bool>> {
self.broadcast_op(other, |a, b| {
let a_vec = a.to_vec();
let b_vec = b.to_vec();
let result: Vec<bool> = a_vec
.iter()
.zip(b_vec.iter())
.map(|(x, y)| *x ^ *y)
.collect();
Array::from_vec(result).reshape(&a.shape())
})
}
/// Element-wise logical NOT
///
/// # Examples
///
/// ```
/// use numrs2::prelude::*;
///
/// let a = Array::from_vec(vec![true, false, true, false]);
/// let result = a.logical_not();
/// assert_eq!(result.to_vec(), vec![false, true, false, true]);
/// ```
pub fn logical_not(&self) -> Array<bool> {
self.map(|x| !x)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_less_than_broadcast() {
let a = Array::from_vec(vec![1.0, 2.0, 3.0]).reshape(&[1, 3]);
let b = Array::from_vec(vec![2.0, 2.0, 2.0]).reshape(&[3, 1]);
let result = a.less_than(&b).expect("less_than broadcast should succeed");
assert_eq!(result.shape(), vec![3, 3]);
}
#[test]
fn test_equal_broadcast() {
let a = Array::from_vec(vec![1, 2, 3]);
let b = Array::from_vec(vec![2, 2, 2]);
let result = a.equal(&b).expect("equal comparison should succeed");
assert_eq!(result.to_vec(), vec![false, true, false]);
}
#[test]
fn test_logical_and() {
let a = Array::from_vec(vec![true, true, false, false]);
let b = Array::from_vec(vec![true, false, true, false]);
let result = a.logical_and(&b).expect("logical_and should succeed");
assert_eq!(result.to_vec(), vec![true, false, false, false]);
}
#[test]
fn test_logical_not() {
let a = Array::from_vec(vec![true, false, true]);
let result = a.logical_not();
assert_eq!(result.to_vec(), vec![false, true, false]);
}
}