Function generate2d 

pub fn generate2d(
    xmin: f64,
    xmax: f64,
    ymin: f64,
    ymax: f64,
    nx: usize,
    ny: usize,
) -> (Vec<Vec<f64>>, Vec<Vec<f64>>)

Generates 2d points (meshgrid)

Input

• xmin, xmax – range along x
• ymin, ymax – range along y
• nx – is the number of points along x (must be >= 2)
• ny – is the number of points along y (must be >= 2)

Output

• x, y – (ny by nx) 2D arrays