Re: Re: Command similar to flatten??

*To*: mathgroup at smc.vnet.net*Subject*: [mg89290] Re: [mg89275] Re: [mg89273] Command similar to flatten??*From*: Andrzej Kozlowski <akoz at mimuw.edu.pl>*Date*: Wed, 4 Jun 2008 05:36:09 -0400 (EDT)*References*: <200806030759.DAA19034@smc.vnet.net> <200806031044.GAA26637@smc.vnet.net>

On 3 Jun 2008, at 19:44, Andrzej Kozlowski wrote: > > On 3 Jun 2008, at 16:59, Erin Noel wrote: > >> Hi all, >> >> I am pretty new to Mathematica coding so bear with me... >> >> I have a list of lists named "A" whose dimensions are {4,10,1100,5} >> and I >> want to basically "combine" those first two levels so that the >> dimensions >> become {40,1100,5} but I have no idea how to do that...Any >> suggestions? >> Thanks a lot in advance. >> >> Erin >> > > Flatten[aa, {{1, 2}}] > > will do it. > > Andrzej Kozlowski > I meant of course Flatten[A,{{1,2}}] (I just used aa in my own example which I did not post) for example: A = Array[a, {2, 3, 4, 5}]; Dimensions[A] {2, 3, 1, 2} B = Flatten[A, {{1, 2}}]; Dimensions[B] {6, 1, 2} Also, note that in the documentation to Flatten in version 6 it clearly states: Flatten[list, {{Subscript[s, 11], Subscript[s, 12], =85}, {Subscript[s, 21], Subscript[s, 22], =85}, =85}] flattens list by combining all levels Subscript[s, ij] to make each level i in the result.

**References**:**Command similar to flatten??***From:*"Erin Noel" <enoel2@gmail.com>

**Re: Command similar to flatten??***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>