[R] The most common row in a matrix?

[Dimitrios Rizopoulos]

try this:

mat <- array(1:3, dim = c(4, 5))
#########
ind <- table(apply(mat, 1, paste, collapse = "/"))
ind <- which.max(ind)
as.numeric(strsplit(names(ind), "/")[[1]])


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
      http://www.student.kuleuven.be/~m0390867/dimitris.htm


Quoting kone <attenka at utu.fi>:

> Hi,
>
> How do you get the most common row from a matrix? If I have a matrix
> like this
>
> array(1:3,dim=c(4,5))
>
>       [,1] [,2] [,3] [,4] [,5]
> [1,]    1    2    3    1    2
> [2,]    2    3    1    2    3
> [3,]    3    1    2    3    1
> [4,]    1    2    3    1    2
>
> in which rows 1 and 4 are similar, I want to find that vector c
> (1,2,3,1,2).
>
> Atte Tenkanen
> University of Turku, Finland
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>



Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm