Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2001
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2001

[Date Index] [Thread Index] [Author Index]

Search the Archive

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg29780] Re: Partitioning 1-D list into 2-D Matrix
  • From: "Orestis Vantzos" <atelesforos at hotmail.com>
  • Date: Sun, 8 Jul 2001 20:35:55 -0400 (EDT)
  • Organization: National Technical University of Athens, Greece
  • References: <9i6ao4$ol6$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

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
>
>




  • Prev by Date: Re: Mathematica generating gifs for avi problem
  • Next by Date: Re: icon to Evaluate Notebook?
  • Previous by thread: RE: Partitioning 1-D list into 2-D Matrix
  • Next by thread: Re: Partitioning 1-D list into 2-D Matrix