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Re: bug or feature ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131285] Re: bug or feature ?
  • From: Adriano Pascoletti <adriano.pascoletti at uniud.it>
  • Date: Mon, 24 Jun 2013 03:58:48 -0400 (EDT)
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  • References: <20130624025718.E40906A07@smc.vnet.net>

Add the option Heads->False (see documentation to Position, details and
options)

In[6]:= Position[{{1, 2}, {2, 3}, {1, 4}}, _?(EvenQ[#1[[2]]] & ), {1},
Heads -> False]
Out[6]= {{1}, {3}}


Adriano Pascoletti


2013/6/24 roby <roby.nowak at gmail.com>

> 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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