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Re: List re-arrangement question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87769] Re: [mg87733] List re-arrangement question
  • From: Carl Woll <carlw at wolfram.com>
  • Date: Wed, 16 Apr 2008 22:30:37 -0400 (EDT)
  • References: <200804160904.FAA24003@smc.vnet.net>

Yaroslav Bulatov wrote:

>I'm trying to do something like the following:
>Transpose[{{{a1, a2, a3}, {a1}, {a1, a2, a3}}, {{b1, b2, b3}, {b1},
>{b1, b2, b3}}}, {3, 1, 2}]
>
>expecting to get:
>{{{a1, b1}, {a2, b2}, {a3, b3}}, {{a1, b1}}, {{a1, b1}, {a2, b2}, {a3,
>b3}}}
>
>However, it looks like Transpose doesn't work with "ragged"
>arrays...so what is the recommended Mathematica style to do the above
>transformation?
>  
>
In version 6, you can use Flatten:

Flatten[
    {{{a1, a2, a3}, {a1}, {a1, a2, a3}}, {{b1, b2, b3}, {b1},{b1, b2, b3}}},
    {{2}, {3}, {1}}
]

{{{a1, b1}, {a2, b2}, {a3, b3}}, {{a1, b1}}, {{a1, b1}, {a2, b2}, {a3, b3}}}

Carl Woll
Wolfram Research


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