[R] Grouping Index of Matrix Based on Certain Condition

[Moshe Olshansky]

y <- 2 - (x[,1] > x[,2])

you can also do

cbind(x,y) 

if you wish.


--- On Fri, 1/8/08, Gundala Viswanath <gundalav at gmail.com> wrote:

> From: Gundala Viswanath <gundalav at gmail.com>
> Subject: [R] Grouping Index of Matrix Based on Certain Condition
> To: r-help at stat.math.ethz.ch
> Received: Friday, 1 August, 2008, 1:00 PM
> Hi,
> 
> I have the following (M x N) matrix, where M = 10 and N =2
> What I intend to do is to group index of (M) based on this
> condition
> of "x_mn" , namely
> 
> For each M,
> If x_m1 > x_m2, assign index of M to Group1
> otherwise assign index of M into Group 2
> 
> 
> > x
>                [,1]       [,2]
>   [1,] 4.482909e-01 0.55170907
>   [2,] 9.479594e-01 0.05204063
>   [3,] 8.923553e-01 0.10764474
>   [4,] 9.295003e-01 0.07049966
>   [5,] 8.880434e-01 0.11195664
>   [6,] 9.197367e-01 0.08026327
>   [7,] 9.431232e-01 0.05687676
>   [8,] 9.460356e-01 0.05396442
>   [9,] 6.053829e-01 0.39461708
>  [10,] 9.515173e-01 0.04848268
> 
> Is there a simple way to do it in R?
> - Gundala Viswanath
> Jakarta - Indonesia
> 
> ______________________________________________
> R-help at r-project.org 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.