Function ldexp 

pub fn ldexp<T, D>(
    x: &Array<T, D>,
    n: &Array<i32, D>,
) -> Result<Array<T, D>, FerrayError>
where
    T: Element + Float,
    D: Dimension,

Multiply x by 2^n (ldexp), with NumPy broadcasting.

n is provided as an integer array; broadcast-compatible with x.