Re: Distribute one list element over another
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- Subject: [mg130496] Re: Distribute one list element over another
- From: Vince Virgilio <blueschi at gmail.com>
- Date: Tue, 16 Apr 2013 04:20:44 -0400 (EDT)
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Thread /@ data[[All,{1,-1}]]
Vince
On Saturday, April 13, 2013 8:36:48 PM UTC-4, Timm Reinisch wrote:
> Hallo,
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>
>
> It's difficult to explain what I want to achieve and maybe if I could
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> describe it better I would have been able to google a solution.
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>
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> My problem deals with lists of lists of the form {a1, a2, a3, {m1, m2,
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> m3, m4}}
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>
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> e.g.
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>
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> data =
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> {
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> {a1, a2, a3, {m1, m2, m3, m4}},
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> {b1, b2, b3, {n1, n2, n3, n4}},
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> {c1, c2, c3, {o1, o2, o3, o4}},
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> {d1, d2, d3, {p1, p2, p3, p4}},
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> }
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>
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> I want is to go over the list and transform each of the sublists {a1,
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> a2, a3, {m1, m2, m3, m4}} into a list consisting of pairs {{a1, m1},
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> {a1, m2}, {a1, m3}, {a1, m4}}
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> so that for the list given above I get
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>
>
> {
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> {{a1, m1}, {a1, m2}, {a1, m3}, {a1, m4}},
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> {{b1, n1}, {b1, n2}, {b1, n3}, {b1, n4}},
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> {{c1, o1}, {c1, o2}, {c1, o3}, {c1, o4}},
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> {{d1, p1}, {d1, p2}, {d1, p3}, {d1, p4}},
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> }
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>
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> I think it could be possible to do this using two nested map operations
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> /@, but I don't find out how to do so exactly, because I run into
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> trouble with the scope of the #
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>
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> What I'm doing at the moment is that I use a module:
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>
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> verteilen[liste_] := Module[{},
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> {#[[1]], liste[[1]]} & /@ liste[[4]]
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> ]
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>
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> and map it over the list I want to transform:
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>
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> verteilen[#] & /@ data
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> I'm searching for a much mor elegant way to achive this transformation,
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> any hints?
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> Thanks and best regards
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>
>
> Timm