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Re: Table extraction

  • To: mathgroup at
  • Subject: [mg19187] Re: [mg19141] Table extraction
  • From: "David Park" <djmp at>
  • Date: Tue, 10 Aug 1999 02:52:46 -0400
  • Sender: owner-wri-mathgroup at


I don't follow the meaning of your example. However, have you looked at the
LinearAlgebra`MatrixManipulation` package?

David Park
djmp at

>I am trying to extract a section of a table with not much luck....
>I have defined two tables (actually two arrays which are used to plot
>vectors with ListPlotVectorField) as follows:
>xyvector = Table[{0.,0.},{j,1,64},{i,1,320}];
>backvector = Table[{0.,0.},{j,1,16},{i,1,100}];
>I need to extract part of xyvector and place it into  backvector. I have
>tried to use Part. I can extract the j range correctly (rows), but I
>can't get the Part function to extract in the i range (columns).
>I tried using Part[xyvector,{2,3}] which extracts 2 rows but I cannot
>figute out how to extract the necessary columns
>Can anyone help?
>Maurice Shevalier                 |       .~.
>Ph.D. Candidate                   |       /V\       L   I   N   U   X
>Dept. of Physics and Astronomy    |      // \\  >The Penguin, The Slayer?<
>University of Calgary             |     /(   )\
>Calgary, AB, CANADA T2N-1N4       |      ^^-^^
>(403)220-7873   fax:(403)284-0074 |
>e-mail: maurice at

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