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// Copyright © 2023 Niklas Siemer
//
// This file is part of qFALL-math.
//
// qFALL-math is free software: you can redistribute it and/or modify it under
// the terms of the Mozilla Public License Version 2.0 as published by the
// Mozilla Foundation. See <https://mozilla.org/en-US/MPL/2.0/>.
//! This module contains the implementation of the `transpose` function.
use crate::traits::MatrixDimensions;
use super::MatZ;
use flint_sys::fmpz_mat::fmpz_mat_transpose;
impl MatZ {
/// Returns the transposed form of the given matrix, i.e. rows get transformed to columns
/// and vice versa.
///
/// # Examples
/// ```
/// use qfall_math::integer::MatZ;
/// use std::str::FromStr;
///
/// let mat = MatZ::from_str("[[2, 1],[2, 1],[2, 1]]").unwrap();
/// let cmp = MatZ::from_str("[[2, 2, 2],[1, 1, 1]]").unwrap();
///
/// assert_eq!(mat.transpose(), cmp);
/// ```
pub fn transpose(&self) -> Self {
let mut out = Self::new(self.get_num_columns(), self.get_num_rows());
unsafe { fmpz_mat_transpose(&mut out.matrix, &self.matrix) };
out
}
}
#[cfg(test)]
mod test_transpose {
use super::MatZ;
use std::str::FromStr;
/// Checks if a row is correctly converted to a column
#[test]
fn row_to_column() {
let mat = MatZ::from_str("[[1],[2],[3]]").unwrap();
let cmp = MatZ::from_str("[[1, 2, 3]]").unwrap();
assert_eq!(cmp, mat.transpose());
}
/// Checks if a column is correctly converted to a row
#[test]
fn column_to_row() {
let mat = MatZ::from_str("[[1, 2, 3]]").unwrap();
let cmp = MatZ::from_str("[[1],[2],[3]]").unwrap();
assert_eq!(cmp, mat.transpose());
}
/// Checks if large, negative, and zero values are transposed correctly
#[test]
fn different_entry_values() {
let mat = MatZ::from_str(&format!("[[{}, {}, 0]]", i64::MAX, i64::MIN)).unwrap();
let cmp = MatZ::from_str(&format!("[[{}],[{}],[0]]", i64::MAX, i64::MIN)).unwrap();
assert_eq!(cmp, mat.transpose());
}
}