... (x - y)^2]): plot(plot::Function3d(f, x = -2 4, y = -1 3)) f := proc(x, y) begin if x + y^2 + 2*y < then else x + y^2 + 2*y end_if: end_proc: plot(plot::Function3d(f, x = -3 2, y = -2 2)) delete ... plot(plot::Function3d(besselJ(0, sqrt(x^2 + y^2)), x = -20 20, y = -20 20, AdaptiveMesh = 2)) Example By default, the parameter lines of a function graph are “switched on”: plot(plot::Function3d(x^2 + ... plot(plot::Function3d(x^2 + y^2, x = 1, y = 1, XLinesVisible = FALSE, YLinesVisible = FALSE)) The number of parameter lines are determined by the Mesh attributes: plot(plot::Function3d(x^2 + y^2,...