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

*To*: mathgroup at smc.vnet.net*Subject*: [mg29760] Re: [mg29758] Partitioning 1-D list into 2-D Matrix*From*: Andrzej Kozlowski <andrzej at tuins.ac.jp>*Date*: Sun, 8 Jul 2001 01:00:06 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

One possibility: In[2]:= Flatten[Transpose[Partition[#,2]]&/@Partition[b,10],1] Out[2]= {{1,3,5,7,9},{2,4,6,8,10},{11,13,15,17,19},{12,14,16,18,20}} -- Andrzej Kozlowski Toyama International University JAPAN http://platon.c.u-tokyo.ac.jp/andrzej/ http://sigma.tuins.ac.jp/~andrzej/ on 01.7.7 3:26 PM, Krautschik, Chris G at krautschikc at intel.co.jp wrote: > I have a question of how to best select elements from a list and reformat > the list into a 2D matrix. Here is an example: > > 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 > > >