I have a function Peak function
I know how to implement it in time range just need to caclulate $r$. first I initial $x$, y with a range and meshgrid them, after it calculate $r$
x=-2:1/100:2; y=-2:1/100:2; [x,y]=meshgrid(x,y); r=sqrt(x.^2 + y.^2); Peak=1./r;
but when I want go to frequency domain, what is $f$ and how it should be initial?
appreciate any urgent help :(