Function sub 

pub fn sub<T: Element>(
    ctx: &GpuContext,
    a: &Buffer<T>,
    b: &Buffer<T>,
    c: &Buffer<T>,
)

Subtracts two buffers element-wise.

Computes c[i] = a[i] - b[i] for all elements.

Panics

• Buffer length exceeds u32::MAX.
• (debug) Buffer lengths do not match.
• (debug) Buffer belongs to a different device than ctx.