plotting problem: getting empty graph window

I want to draw this

cos(8*pi*x)/(1+x^2) for x in [-1, 1]

but I get empty graph. How can I correct this?

Answer 1

[Stephan]

fun = @(x) cos(8*pi.*x)./(1+x.^2)
fplot(fun,[-1, 1])

[Zeynep Toprak]

thanks a lot

[Stephan]

fplot(fun,[-1, 1],'-.g')

or:

x = linspace(-1,1,500);
y = fun(x);
plot(x,y,'.g')