[R] Finding the column with the maximum value by row
R. Michael Weylandt
michael.weylandt at gmail.com
Wed Jul 18 00:08:57 CEST 2012
apply(a, 1, which.max)
Apply the which.max() function to the matrix a row-wise (1)
On Tue, Jul 17, 2012 at 5:03 PM, Christopher Desjardins
<cddesjardins at gmail.com> wrote:
> Let's say I have the following data:
> [,1] [,2] [,3]
> [1,] 1 2 4
> [2,] 4 2 1
> [3,] 1 2 4
> What syntax should I use to get R to tell me the column that corresponds to
> the maximum value for each row?
> For my example, I would like to get a vector that says 3, 1, 3 because the
> maximum value for row 1 is in column 3, the maximum value for row 2 is in
> column 1, and the maximum value for row 3 is in column 3.
> Does that make sense?
> Please cc me if you reply!
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