pub fn fast_2d_step(x: &Vec<f64>, y: &Vec<f64>) -> (Vec<f64>, Vec<f64>)
Returns the tuple of vector points of a single smoothening iteration
- x = vector of points on x axis
- y = vector of points on y axis
- x = augmented vector of smoothed points on x axis
- y = augmented vector of smoothed points on y axis