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MathGroup Archive 1999

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Element extraction

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19579] Element extraction
  • From: Mark Lawrence Storch <mscc+ at andrew.cmu.edu>
  • Date: Sat, 4 Sep 1999 01:34:20 -0400
  • Organization: Doctoral student, Materials Science and Engineering, Carnegie Mellon, Pittsburgh, PA
  • Sender: owner-wri-mathgroup at wolfram.com

Hello,
    I am having a bit of trouble trying to extract elements out of
nested lists.  I have an X x Y array where each element of the array is
a 3x3 matrix.  I am trying to make density plots of each component.  For
example, I would like to plot the 1,1 components of each element of the
larger array.  I have tried the following:

Array[g[[i,j][[a,b]],{i,Dimensions[g][[1]]},{j,Dimensions[g][[2]]}]

where I am trying to get the a,b component

This does not work, and I am not seeing exactly why not.  I am hoping
someone can point out my error or suggest a way to extract the lists I
need.

Thank you,
Mark Storch
Carnegie Mellon University
Department of Materials Science 


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