How can I graph this function?

I know it´s pretty basic, but I just need to graph these functions and I certainly know nothing about graphs in matlab.

The functions are z = (5*(x^2 )(y^4 ))/(x^2+y^2 ) and a similar one. When I try to graph them I get a z matrix full of Nan.

What code should I use?

[James Tursa]

Please show us your current code and we can suggest corrections.

[JXT119]

@James Tursa My code is similar to the one Matteo has written, but what I want to get is something like this

Is it possible to do such thing?

Answer 1

[Matteo Pellegri]

You can use the symbolic toolbox.

syms x y
f(x,y) = 5*x^2*y^4/(x^2+y^2);
fsurf(f(x,y));

You adjust the aspect of the graph yourself.

Alternatively if you use the matix form you should use element-wise operation i.e.

[x,y] = meshgrid(-100:100,-100:100);
z = (5*(x.^2 ).*(y.^4 ))./(x.^2+y.^2);
surf(x,y,z);