Transpose Matrix in Rust

Published on 17 April 2023 (Updated: 17 April 2023)

Welcome to the Transpose Matrix in Rust page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

use std::env::args;
use std::process::exit;
use std::str::FromStr;

fn usage() -> ! {
    println!("Usage: please enter the dimension of the matrix and the serialized matrix");

fn parse_int<T: FromStr>(s: &str) -> Result<T, <T as FromStr>::Err> {

fn parse_int_list<T: FromStr>(s: &str) -> Result<Vec<T>, <T as FromStr>::Err> {
        .collect::<Result<Vec<T>, <T as FromStr>::Err>>()

type Matrix<T> = Vec<Vec<T>>;

fn convert_array_to_matrix<T: Copy>(
    arr: Vec<T>, num_rows: usize, num_cols: usize
) -> Matrix<T> {
    // Combine 'num_rows' vectors of 'num_cols' items from array
    let mut arr_iter = arr.iter();
        .map(|_| *

fn transpose_matrix<T: Copy>(matrix: Matrix<T>) -> Matrix<T> {
    let num_rows = matrix.len();
    let num_cols = matrix[0].len();

    // Construct transposed matrix by grabbing one item from each row
    // and combining them
                .map(|row| matrix[row][col])

fn convert_matrix_to_array<T: Copy>(matrix: Matrix<T>) -> Vec<T> {
    let mut arr: Vec<T> = vec![];
    for mut row in matrix {
        arr.append(&mut row);


fn main() {
    let mut args = args().skip(1);

    // Convert 1st command-line argument to integer
    let num_cols: usize = args
        .and_then(|s| parse_int(&s).ok())
        .unwrap_or_else(|| usage());

    // Convert 2nd command-line argument to integer
    let num_rows: usize = args
        .and_then(|s| parse_int(&s).ok())
        .unwrap_or_else(|| usage());

    // Convert 3rd command-line argument to list of integers
    let arr: Vec<i32> = args
        .and_then(|s| parse_int_list(&s).ok())
        .unwrap_or_else(|| usage());

    // Exit if invalid number of columns, rows, and size of array
    if num_cols == 0 ||
        num_rows == 0 ||
        arr.len() != num_cols * num_rows {

    // Convert array to matrix
    let matrix: Matrix<i32> = convert_array_to_matrix::<i32>(arr, num_rows, num_cols);

    // Transpose matrix
    let matrix_t = transpose_matrix::<i32>(matrix);

    // Show transposed matrix as an array
    let arr_t = convert_matrix_to_array::<i32>(matrix_t);

Transpose Matrix in Rust was written by:

If you see anything you'd like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of May 08 2023 19:53:07. The solution was first committed on Apr 17 2023 16:06:14. As a result, documentation below may be outdated.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.