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MathGroup Archive 2007

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Re: How to find the index of a maximal element in a list?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72943] Re: [mg72911] How to find the index of a maximal element in a list?
  • From: Carl Woll <carlw at wolfram.com>
  • Date: Fri, 26 Jan 2007 06:18:26 -0500 (EST)
  • References: <200701251119.GAA19752@smc.vnet.net>

Valter Sorana wrote:

>I may have a mental block, but I cannot find anything better than
>
>Position[listName,Max[listName]]
>
>that traverses the list twice - once to find the maximum and once to find where it is.
>
>Isn't there a way to get both the index and the max value in one go?
>
>(of course one could write a loop that does this, but I want to avoid loops)
>
>Thanks,
>
>Valter.
>  
>
Use Ordering:

lst={1,2,10,2};

Ordering[lst,-1]
{3}

Finding the max value using Part once the index is known is practically 
instantaneous.

Carl Woll
Wolfram Research


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