Question: Swap rows/columns idiomatically in ndarray

[skailasa]

I'd like to swap the rows/columns of a given 2D ndarray idiomatically. I've found this question: #545, which explains that one can create two mutable array views, however it doesn't explain how this is done. I've done something hacky, like so,

fn swap(mut keys: KeysViewMut, i: usize, j: usize) {

    let mut row_x = keys.index_axis_mut(ndarray::Axis(0), 0);
    row_x.swap(i, j);
    {
        let mut row_y = keys.index_axis_mut(ndarray::Axis(0), 1);
        row_y.swap(i, j);
    }
    {
        let mut row_z = keys.index_axis_mut(ndarray::Axis(0), 2);
        row_z.swap(i, j);
    }
    {
        let mut row_l = keys.index_axis_mut(ndarray::Axis(0), 3);
        row_l.swap(i, j);
    }
}

To ensure that the borrows are in their own scope.

[bluss]

For example the rows_mut producer is an ndproducer and iterable, so it can give you array views of all the rows simultaneously.

There's a good solution in using the multi_slice_mut - you can cut out multiple slices however you want, and that didn't exist back then when the other question was asked.