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MathGroup Archive 2005

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Return[] in pure function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58870] Return[] in pure function
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 21 Jul 2005 15:46:02 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,
I seems to me that there is a bug in the implementation of pure 
functions. If somebody can explain the following behaviour it would be 
interessting. If not, maybe Wolfram can contribute something.
Consider
f[x_]:= If[x==0,Return[Error],x];
f /@ {1,0}
gives {1,Error} what is fine.
Now replace the function by a pure function:
If[#==0,Return[Error],#]& /@ {1,0}
this gives {1,Return["Error"]}. The Return statement has not been evaluated.

sincerely, Daniel


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