Function rollaxis 

pub fn rollaxis<T: Element, D: Dimension>(
    a: &Array<T, D>,
    axis: usize,
    start: usize,
) -> FerrayResult<Array<T, IxDyn>>

Roll an axis to a new position (similar to moveaxis).

Analogous to numpy.rollaxis().

Errors

Returns FerrayError::AxisOutOfBounds if axis >= ndim or start > ndim.