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MathGroup Archive 2012

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Matrix operation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg125753] Matrix operation
  • From: Andrey Demidov <andrey.demidov at gmail.com>
  • Date: Sat, 31 Mar 2012 03:45:04 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Hi,

I have a matrix:

>> s1 = {{0, 4, 3, 6, 1, 0, 0, 30}, {0, 6, 16, 8, 0, 1, 0, 256}, {0, 4, 1,
    10, 0, 0, 1, 9}, {1, -2, -4, -3, 0, 0, 0, 0}}

>> MatrixForm[s1]

Now, I need to get another matrix (s2) where:

   - s2[i, j] = s1[i, j] where i <> 4
   - s2[i, j] = s1[i, j] + 4 * s1[i - 1, j] where i == 4

What is the best way to get s2 ?



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