If you look at the documentation page where you found that example, the usage is given: emphasis mine. mesh(X,Y,Z) creates a mesh plot, ... ... <看更多>

In analogy with the more common two-dimensional plots discussed earlier, these can be created using the ax.plot3D and ax.scatter3D functions. ... <看更多>

When you have some problems with 3D plots in Matlab, it is often helpful to use different grids for x and y. For example, if you change your code as v ... ... <看更多>