>>> sage: data = [-1, 2, 3]
>>> sage: [(0 if d < 0 else d) for d in data]
> sage: data = ma_eval('data /. x_?(# < 0 &) -> 0')
Couldn't stop myself from showing how that would work in Maple,
data:=[-1,2,3]:
evalindets(data,negative,0);
[0, 2, 3]
Alec
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