[R] Graphing a piece-wise defined function

[thedoctor81877]

Hello. I am new to R, and am typing some homework for my undergrad Analysis
class. I am trying to graph the following function in R: f(x) = x^2 for x
>=0, and f(x) = 0 for x <0. How do I do this in R?

Thanks for the help.
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