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Replace & Rationalize

  • To: mathgroup at smc.vnet.net
  • Subject: [mg121509] Replace & Rationalize
  • From: "Chris Degnen" <degnen at cwgsy.net>
  • Date: Sun, 18 Sep 2011 04:10:01 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Further to a question on Stack Overflow I noticed a puzzling
evaluation.  Why does the second expression generate reals?

(x \[Function] 
   If[IntegerQ[Rationalize[x]], Rationalize[x], x]) /@ {0., 1.}

{0., 1.} /. x_ /; IntegerQ[Rationalize[x]] -> Rationalize[x]






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