Re: Need help to find position of max location

• To: mathgroup at smc.vnet.net
• Subject: [mg86583] Re: Need help to find position of max location
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Thu, 13 Mar 2008 20:56:23 -0500 (EST)
• Organization: Uni Leipzig
• References: <fras8b\$1cc\$1@smc.vnet.net>

```Hi,

MaxRow[mtx_?MatrixQ] := MaxRow /@ mtx
MaxRow[lst_List] := Position[lst, Max[lst]] /. {i_Integer} :> i

and

MaxRow[{{82, 71, 62, 47}, {52, 96, 31, 36}, {94, 52, 86, 12}}]

will return

{{1}, {2}, {1}}

I would not suggest to have a result like
{1,2,1}

because you can have more than a single occurrence
of the maximum and
MaxRow[{{82, 71, 82, 47}, {52, 96, 31, 36}, {94, 52, 86, 12}}]

will return
{{1, 3}, {2}, {1}}
as it should.
Regards
Jens
haitomi wrote:
> Hi All,
>
> I would like to find position of this problem
>
> 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 30 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},
>
> }
>
> t=Table[RandomInteger[{30,99}],{i,1,3},{j,1,4}]
>
> max=Map[Max,t]
>
> and I stuck at Position of each Row, if someone can help me.
>
> Thanks
>

```

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