[R] Combinations

[arun]

HI,
Try this:
T1<- paste0("c",1:5)
 T2<- paste0("k",1:5)

  as.vector(outer(T1,T2,paste,sep=","))
# [1] "c1,k1" "c2,k1" "c3,k1" "c4,k1" "c5,k1" "c1,k2" "c2,k2" "c3,k2" "c4,k2"
#[10] "c5,k2" "c1,k3" "c2,k3" "c3,k3" "c4,k3" "c5,k3" "c1,k4" "c2,k4" "c3,k4"
#[19] "c4,k4" "c5,k4" "c1,k5" "c2,k5" "c3,k5" "c4,k5" "c5,k5"
#or
 paste("(",as.vector(outer(T1,T2,paste,sep=",")),")",sep="")
 #[1] "(c1,k1)" "(c2,k1)" "(c3,k1)" "(c4,k1)" "(c5,k1)" "(c1,k2)" "(c2,k2)"
 #[8] "(c3,k2)" "(c4,k2)" "(c5,k2)" "(c1,k3)" "(c2,k3)" "(c3,k3)" "(c4,k3)"
#[15] "(c5,k3)" "(c1,k4)" "(c2,k4)" "(c3,k4)" "(c4,k4)" "(c5,k4)" "(c1,k5)"
#[22] "(c2,k5)" "(c3,k5)" "(c4,k5)" "(c5,k5)"
A.K.





----- Original Message -----
From: Amir <adarehsh at uottawa.ca>
To: r-help at r-project.org
Cc: 
Sent: Friday, March 15, 2013 9:22 AM
Subject: [R] Combinations

Hi every one,

I have two sets T1={c1,c2,..,cn} and T2={k1,k2,...,kn}.
How can I find the sets as follow:

(c1,k1), (c1,k2) ...(c1,kn)  (c2,k1) (c2,k2) .... (c2,kn) ... (cn,kn)

Thanks.
Amir

-- __________________________________________________________________________
Amir Darehshoorzadeh             |  Computer Engineering Department
PostDoc Fellow                   |  University of Ottawa, PARADISE LAb
Email: adarehsh at uottawa.ca       |  800 King Edward Ave
Tel: -                           |  ON K1N 6N5, Ottawa - CANADA
http://personals.ac.upc.edu/amir

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