Re: Partitioning 1-D list into 2-D Matrix

*To*: mathgroup at smc.vnet.net*Subject*: [mg29792] Re: Partitioning 1-D list into 2-D Matrix*From*: "Orestis Vantzos" <atelesforos at hotmail.com>*Date*: Tue, 10 Jul 2001 20:25:30 -0400 (EDT)*Organization*: National Technical University of Athens, Greece*References*: <9i6ao4$ol6$1@smc.vnet.net> <9iaues$17m$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Sorry everybody. Didn't pay close attention to the requested matrix! Won't do it again... Orestis "Orestis Vantzos" <atelesforos at hotmail.com> wrote in message news:9iaues$17m$1 at smc.vnet.net... > Why use Partition 2 times!?! > Partition[b,5] returns the matrix you want. > Generaly a single application of Partition to a vector will return a > (rectangular) matrix. As a second argument to Partition you can supply any > divisor of the Length of the vector. > Orestis > > > "Krautschik, Chris G" <krautschikc at intel.co.jp> > > > > b=Range[1,20] > > {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20} > > > > I would like to arrange the list into a 2D array of the following form: > > {{1, 3, 5, 7, 9}, {2, 4, 6, 8, 10}, {11, 13, 15, 17, 19}, {12, 14, 16, 18, > > 20}} > > > > Then > > bb=Partition[Partition[b,2],5] > > <<...OLE_Obj...>> > > almost does what I want if you view this array in MatrixForm[]. However, I > > would have to somehow get rid of the innner brackets. I am not sure how to > > do that with Flatten[]. > > > > I could use brute force and select the elements as follows: > > <<...OLE_Obj...>> > > <<...OLE_Obj...>> > > > > I have a feeling there is a much better way to do this. > > > > Thanks in advance, > > Chris > > > > > > >