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I have a function Peak function enter image description here

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 $r$

r=sqrt(x.^2 + y.^2);

but when I want go to frequency domain, what is $f$ and how it should be initial?

appreciate any urgent help :(

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