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Re: bug or feature ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131284] Re: bug or feature ?
  • From: Ray Koopman <koopman at sfu.ca>
  • Date: Mon, 24 Jun 2013 03:58:27 -0400 (EDT)
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Position[{{1, 2}, {2, 3}, {1, 4}}, _?(EvenQ[#[[2]]] &), {1}, Heads->False]

{{1},{3}}

Position[{{1, 2}, {2, 3}, {1, 4}}, {__}?(EvenQ[#[[2]]] &), {1}]

{{1},{3}}

Position[{{1, 2}, {2, 3}, {1, 4}}, _List?(EvenQ[#[[2]]] &), {1}]

{{1},{3}}

----- roby <roby.nowak at gmail.com> wrote:
> Dear Group
> 
> When trying to evaluate the following code the expected result is returned.
> But strangly there is an error message generated.
> The code should (and does) return the positions of all sublists with an even element at the second position.
> 
> Position[{{1, 2}, {2, 3}, {1, 4}}, _?(EvenQ[#[[2]]] &), {1}]
> 
> Part::partd: Part specification List[[2]] is longer than depth of object. >>
> 
> {{1}, {3}}
> 
> 
> Any hints if this a bug or a feature ?
> 
> Regards Robert



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