$(1\mathrm{.}25$ points, Explore MATLAB on Your Own$)$ Write a MATLAB $m$ file to plot the $3-D$ plot of a

multivariable function $z(x,y)=x^2-0\mathrm{.}5y^2$ over xin$[-2,2]$ and yin$[-2,2].$ For both $x$ and $y$ axes,

choose the grid size to be $0\mathrm{.}05.$ Clearly label and title your plot. $($Hints: $(1)$ you may see that $z$ is the

function of both variables $x$ and $y$; $(2)$ The function, mesh, may help you to draw the figure.$)$