How to plot only certain values in a surface plot?

I am plotting the following surface:

[X,Y] = meshgrid(-5:.2:5);                                
Z = -0.15*sin(X).*(X) + 0.2*(Y.^2) +3 ;
surf(X,Y,Z)

I do not want values of Z > 4 to appear on my surface plot.

How could I achieve this?

Many thanks in advance

Answer 1

[Star Strider]

Two options:

1. Set Z > 4 to NaN:

[X,Y] = meshgrid(-5:.2:5);                                
Z = -0.15*sin(X).*(X) + 0.2*(Y.^2) +3 ;
Z(Z>4) = NaN;

figure
surf(X,Y,Z)

2. Use a zlim cutoff:

[X,Y] = meshgrid(-5:.2:5);                                
Z = -0.15*sin(X).*(X) + 0.2*(Y.^2) +3 ;

figure
surf(X,Y,Z)
zlim([min(zlim) 4])

There may also be other possibiloities.