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MathGroup Archive 2001

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Re: matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28405] Re: [mg28383] matrix
  • From: BobHanlon at aol.com
  • Date: Mon, 16 Apr 2001 03:28:58 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Using a smaller example, let the matrix be 10 by 5 and rows  4 through 7 will 
be ones.

nbrRows = 10; nbrCols = 5; startOnesRow = 4; lastOnesRow = 7;

mat = Join[
    Table[0, {startOnesRow-1}, {nbrCols}], 
    Table[1, {lastOnesRow-startOnesRow+1}, {nbrCols}], 
    Table[0, {nbrRows-lastOnesRow}, {nbrCols}]]

{{0, 0, 0, 0, 0}, {0, 0, 0, 0, 0}, 
  {0, 0, 0, 0, 0}, {1, 1, 1, 1, 1}, 
  {1, 1, 1, 1, 1}, {1, 1, 1, 1, 1}, 
  {1, 1, 1, 1, 1}, {0, 0, 0, 0, 0}, 
  {0, 0, 0, 0, 0}, {0, 0, 0, 0, 0}}


Bob Hanlon

In a message dated 2001/4/15 6:10:12 AM, susuwin at post.kek.jp writes:

>How can I make a matrix (4000x1220) with zeros except that all the values
>at
>216th to 220th rows are ones.


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