Grokbase Groups R r-help March 2002
FAQ

For a vector:
max(a1) [1] 16667
(1:length(a1))[a1==max(a1)]
[1] 6175
or
which.max(a1)
[1] 6175

For a matrix:
a2 <- matrix(1:12,ncol=3)
a2
[,1] [,2] [,3]
[1,] 1 5 9
[2,] 2 6 10
[3,] 3 7 11
[4,] 4 8 12
max(a2) [1] 12
which.max(a2) [1] 12
col(a2)
[,1] [,2] [,3]
[1,] 1 2 3
[2,] 1 2 3
[3,] 1 2 3
[4,] 1 2 3
col(a2)[12] [1] 3
row(a2)[12]
[1] 4

Agus


Dr. Agustin Lobo
Instituto de Ciencias de la Tierra (CSIC)
Lluis Sole Sabaris s/n
08028 Barcelona SPAIN
tel 34 93409 5410
fax 34 93411 0012
alobo at ija.csic.es

On Tue, 5 Mar 2002, Patrick Buetzberger wrote:

Dear R-users,

I'm trying to extract the exact location of the maximum value in a
vector or a matrix, meaning I want not only the maximum itself but also
at which position (e.g row 6, column 12) it is located.
I appreciate any suggestions.
Thanks,

Patrick
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