How do I make a Hexagonal Shaped Mesh?

Hi,

I would like to make a hexagonal shaped mesh from this square mesh

x=linspace(-10,10,100);

y=linspace(-10,10,100);

[X,Y] = meshgrid(x,y);

I would like the hexagon bounded by the lines

y=-x(3^(1/2))-10(3^(1/2));

y=x(3^(1/2))+10(3^(1/2));

y=-x(3^(1/2))+10(3^(1/2));

y=x(3^(1/2))-10(3^(1/2));

y=5(3^(1/2));

y=-5(3^(1/2));

Not sure how to do this.

Thanks!