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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- Delivered-to: l-mathgroup@wolfram.com
- Delivered-to: mathgroup-outx@smc.vnet.net
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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