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You seem unfamiliar with Mathematica syntax. gr[x_] := Piecewise[{{x, x > 1}, {0, x <= 0}}]; Plot[gr[x], {x, -5, 5}] Note too that your function is not defined for $0 < x \leq 1$. Is that really what you want? It is also good programming style to order the elements in a Piecewise from low to high (left-to-right on the number line), i.e., ...

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