Function masked_sub_array 

pub fn masked_sub_array<T, D>(
    ma: &MaskedArray<T, D>,
    arr: &Array<T, D>,
) -> FerrayResult<MaskedArray<T, D>>
where
    T: Element + Sub<Output = T> + Copy,
    D: Dimension,

Subtract a regular array from a masked array, treating the regular array as unmasked. Broadcasts within the same dimension type.