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Re: Need Help to find max position location

  • To: mathgroup at smc.vnet.net
  • Subject: [mg86600] Re: Need Help to find max position location
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Fri, 14 Mar 2008 04:18:56 -0500 (EST)

On 3/13/08 at 8:51 PM, tpnycity at yahoo.com (haitomi) wrote:

>Write a function that returns a list that gives the column location
>of the largest integer in each row of a matrix (a list of lists) of
>random integers between 10 and 99.

>Example, for the following 3 X 4 matrix the result is

>{1,2,1}

>{
>{82, 71, 62, 47}, {52, 96, 31, 36}, {94, 52, 86, 12}}

The function you want is Ordering. Using this example with the
matrix assigned to the variable data, either

In[4]:= Ordering[#, -1] & /@ data // Flatten

Out[4]= {1,2,1}

Or

In[5]:= (Ordering /@ data)[[All, -1]]

Out[5]= {1,2,1}

does the trick
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