How to stop extraneous lines when using 'mesh'?

Hi,

I am having problems with the 'mesh' command (see picture below). The command is inserting lines that are not part of the surface under consideration (hyperbolic paraboloid in this case). Is there a way of stopping this happening?

Thanks

Nic

P. S. Interestingly when this is converted to a *.jpeg the extraneous lines disappear.

[Star Strider]

Difficult to say without seeing the code you used to generate it.

Answer 1

[Mischa Kim]

Does this help?

 x = -1:0.1:1;
 y = -1:0.1:1;
 [X,Y] = meshgrid(x,y);
 Z = power(Y,2) - power(X,2) - 0.5;
 mesh(X,Y,Z)
 box

[Mischa Kim]

OK. Try to see if changing the renderer does the trick:

 set(gcf, 'Renderer', 'OpenGL');

or

 set(gcf, 'Renderer', 'zbuffer');

Alternatively, check

 set(gcf,'EdgeAlpha',0.99)

Answer 2

[Nic Roberts]

No that just puts a box around it, but the extra lines are still there.

The code I used was,

[x,y]=meshgrid(-1:0.1:1);

a=-3;

b=1;

z=0.5*(a*x.^2 + b*y.^2);

mesh(x,y,z);