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MathGroup Archive 2007

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Find index of maximal element in multi-dimensional array

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73492] Find index of maximal element in multi-dimensional array
  • From: "Andrew Moylan" <andrew.j.moylan at gmail.com>
  • Date: Tue, 20 Feb 2007 06:15:47 -0500 (EST)

Hi all,

Here's a two-dimensional array of numbers:

z = Table[Random[], {5}, {6}]

What's an efficient way of finding the index of the maximal element of
z? Here's one way:

Last[Sort[Flatten[MapIndexed[{#2, #1} & , z, {2}], 1],
   OrderedQ[{#1[[2]], #2[[2]]}] & ]]

The output is like this:

{{5, 4}, 0.921344}

But it's so untidy. Any better ideas?

Cheers,

Andrew



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