find the median of all elements in an array in rust

To find the median of all elements in an array in Rust, we can apply a simple algorithmic approach.

1. First, we sort the array in ascending order.
2. Next, we check if the size of the array is odd or even.
3. If the size is odd, we select the middle element as the median.
4. If the size is even, we select the middle two elements and take their average as the median.

Here is a Rust code example that implements the above approach:

main.rs
fn median(arr: &mut [f64]) -> f64 {
    let len = arr.len();
    
    // Sort the array in ascending order
    arr.sort_by(|a, b| a.partial_cmp(b).unwrap());
    
    if len % 2 != 0 {
        // If the length is odd, return the middle element
        arr[len / 2]
    } else {
        // If the length is even, return the average of middle two elements
        (arr[len / 2 - 1] + arr[len / 2]) / 2.0
    }
}
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In the code above, arr is a mutable slice of type &mut [f64] which contains the elements of the array. The function median returns the median value of the array as a floating-point number of type f64.

Note that this implementation modifies the original array, so if you need to preserve the original order, you should create a copy of the array before sorting it.