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The output y will be identical with the input u whenever u is greater than or equal to zero. It will be zero in all other cases.
In the default setting (strict = false) in the Advanced tab, nonnegativity will be strictly ovserved:
if strict then
y = noEvent(if u < 0 then 0 else u);
else
y = smooth(0, if u < 0 then 0 else u);
end if;