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MathGroup Archive 2004

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Re: newbie myHead question

  • To: mathgroup at
  • Subject: [mg47042] Re: [mg47017] newbie myHead question
  • From: Bob Walker <walkerbg at>
  • Date: Mon, 22 Mar 2004 05:18:55 -0500 (EST)
  • References: <>
  • Sender: owner-wri-mathgroup at

n = Apply[myHead, Transpose[m]]


János wrote:

>I have
>m = {{a, b}, {a, b}, {a, b}}
>When I apply Transpose to it, I will have
>{{a, a, a}, {b, b, b}}
>The FullForm of it is
>List[List[a, a, a], List[b, b, b]]
>Now, if I do
>n = Apply[myHead, m]
>I get
>myHead[{a, b}, {a, b}, {a, b}]
>If I apply Transpose to it, I get
>Transpose[myHead[{a, b}, {a, b}, {a, b}]]
>The FullForm of it
>Transpose[myHead[List[a, b], List[a, b], List[a, b]]]
>which is not that I need.  I need
>myHead[List[a, a, a], List[b, b, b]]
>What am I missing ?  What should I do to get myHead[{a,a,a},{b,b,b}] ?
>Thanks ahead,
>clear perl code is better than unclear awk code; but NOTHING comes 
>close to unclear perl code

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