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Alex Rivera
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I am wondering if this is a bug or a documented behaviour? f1 = Function[v, Do[If[v[[i]] < 0, Return[v[[i]]]], {i, 1, Length[v]}]] c1 = Compile[{{v, _Integer, 1}}, Do[If[v[[i]] < 0, Return[v[[i]]]], {i, 1, Length[v]}]] When applying them to a list containing no negative numbers, we get different results: In[66]:= Through[{f1, c1}[{1, 2, 3}]] Out[66]= {Null, 3} This has caused a bug when I tried to compile a short function (actually a modified version of it). Do alone doesn't show the problem: c2 = Compile[{}, Do[i, {i, 5}]] c2[] (* returns nothing, as expected *)
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