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MathGroup Archive 2010

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Why Return[] does not work?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg109448] Why Return[] does not work?
  • From: Dims <dims12 at hotmail.com>
  • Date: Tue, 27 Apr 2010 07:41:50 -0400 (EDT)

I wrote a function to check if two lists contain equal members:

Intersects[x_List,
  y_List] := (Do[(Print["Outer step ", xi];
    Do[(Print[xi, yi];
      If[xi == yi, (Print["Returning True"]; Return[True])]), {yi,
      y}]), {xi, x}]; False)

But it returns False for interecting lists:

In[47]:= Intersects[{a, b}, {c, a}]
During evaluation of In[47]:= Outer step a
During evaluation of In[47]:= ac
During evaluation of In[47]:= aa
During evaluation of In[47]:= Returning True
During evaluation of In[47]:= Outer step b
During evaluation of In[47]:= bc
During evaluation of In[47]:= ba
Out[47]= False

Few questions:

1) why does not Return[] interrupt the loops?
2) is there better way to implement intersection check?

Thanks


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