Partitioning 1-D list into 2-D Matrix

*To*: mathgroup at smc.vnet.net*Subject*: [mg29758] Partitioning 1-D list into 2-D Matrix*From*: "Krautschik, Chris G" <krautschikc at intel.co.jp>*Date*: Sat, 7 Jul 2001 02:26:02 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

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