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MathGroup Archive 2007

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Re: sort and positon matrix element help

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73094] Re: [mg73050] sort and positon matrix element help
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Thu, 1 Feb 2007 04:48:14 -0500 (EST)
  • Reply-to: hanlonr at cox.net

data=Table[Random[Integer,{0,100}],{100},{100}];

pos=Map[{#,Position[data, #]}&,data//Flatten//Union//Reverse]


Bob Hanlon

---- "comp.soft-sys.math.mathematica" <phdrelated at gmail.com> wrote: 
> Hi, guys,
> 
>         I am attacking one proble and may need your help.
>         I have a large matrix(m*n). I wanna to sort out the matrix 
> from large to small according to its element's value AND save the 
> corresponding row and column number as its position. Latter on, plot 
> out the first 20 largest value accroding to their positions.
>         Is there any good way to do this, especially take out the 
> positons of element and assocate it with the value?
> 


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