Function sub_assign 

pub fn sub_assign<T>(backend: ComputeBackend, y: &mut Field<T>, x: &Field<T>)
where
    T: Copy + Send + Sync + Sub<Output = T>,

In-place subtraction y[i] -= x[i]. Allocation-free.

Units: y and x are the same physical quantity.

Panics

Panics if y.len() != x.len().