[R] Comparing rows of matrices with different dimensions

[Dimitris Rizopoulos]

how about:

a <- cbind(1:4, c(4, 6, 6, 8), 9:12)
b <- cbind(1:3, 4:6)
#####
apply(b, 1, paste, collapse = "") %in% apply(a[, -3], 1, paste, 
collapse = "")


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://www.med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm



----- Original Message ----- 
From: "Antje Döring" <Antje.Doering at komdat.com>
To: <r-help at stat.math.ethz.ch>
Sent: Monday, November 21, 2005 4:57 PM
Subject: [R] Comparing rows of matrices with different dimensions


>
>
> Hi there,
>
>
>
> I have a question, which I thought is very easy to solve, but 
> somehow I can't find a solution. Probably someone could help me 
> quickly?
>
>
>
> Here it is:
>
>
>
> I have two matrices:
>
>
>
> a
>
>     [,1] [,2] [,3]
>
> [1,]    1    4    9
>
> [2,]    2    6   10
>
> [3,]    3    6   11
>
> [4,]    4    8   12
>
>
>
>
>
> b
>
>     [,1] [,2]
>
> [1,]    1    4
>
> [2,]    2    5
>
> [3,]    3    6
>
>
>
> Now I want to find out which rows of b can also be found in a 
> (without its last column). So the solution must be something like 
> either "TRUE FALSE TRUE" or the rows where their is a match (rows 1 
> and 3)
>
>
>
> Till now I have tried things like b %in% a[,1:2] or so but that 
> doesn't work because I want to compare the WHOLE row of b with the 
> whole row of a without column 3.
>
>
>
> Thank you very much for any help.
>
>
>
> Regards, Antje
>
>
> [[alternative HTML version deleted]]
>
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