Plotting the parabolic cylinder

> plot3d('x'^2,'x'=-1.5..1.5,'y'=-1.5..1.5,scaling=constrained,axes=frame,labels=['x','y','z']);

Again, notice the quotes around the x, y, and z. This is again to "delay the evaluation" of these names, because they are still assigned to . , and . Without the quotes, Maple would produce an error message.

>