Re: Find index of maximal element in multi-dimensional array

• To: mathgroup at smc.vnet.net
• Subject: [mg73591] Re: Find index of maximal element in multi-dimensional array
• From: "Dana DeLouis" <dana.del at gmail.com>
• Date: Thu, 22 Feb 2007 04:41:16 -0500 (EST)

```> The output is like this:
> {{5, 4}, 0.921344}

Hi.  One of many ways...

SeedRandom[2];
z = Table[Random[], {5}, {6}];

Position[z, Max[z]] /. (v_)?VectorQ :> {v, Extract[z, v]}

{{{4, 3}, 0.9585506645732469}}

--
HTH
Dana DeLouis
Windows XP & Mathematica 5.2

"Andrew Moylan" <andrew.j.moylan at gmail.com> wrote in message
news:erelbt\$7h4\$1 at smc.vnet.net...
> 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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