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A little help with sort

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112494] A little help with sort
  • From: "Blackwell, Keith" <Keith.Blackwell at rbccm.com>
  • Date: Fri, 17 Sep 2010 06:42:23 -0400 (EDT)

The problem I am having:

Let's  say I have a 200 x 200 matrix.

I want to sort it in order of the values in column one.

Then I want it to sort all the doubles by the values in column two.

Then I want it to sort all the double doubles by reverse of the values
of column 4 or whatever. 

Is there an easy way to do this. I know I can write something long and
annoying to do it, but I'm getting to the point in my use of mathematica
where I want to write more concise code.

Sort[Matrix, #1[[1]]>#2[[1]]&] seems to totally negate any pre
sorting... I tried to fold it backwards starting from column 4 and it
seems that sort just ignores whatever I do then.

Thanks in advance,

Keith
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