Dear all: 

I have this: 

A1 B1 C1 D1 E1 
A2 B2 C2 D2 E2 
A3 B3 C3 D3 E3 

And I want this 

A1 E1 
B1 E1 
C1 E1 
D1 E1 
A2 E2 
B2 E2 
C2 E2 
D2 E2 
A3 E3 
B3 E3 
C3 E3 
D3 E3 

Example: 

m<- matrix(1:15,nrow=3,byrow=T) 
m 
v<- unlist(list(t(m[,1:4]))) 
u<- rep(c(5,10,15),c(4,4,4)) 
data.frame(v,u) 

This is the result I want but I would like to learn a simpler way to do it. 
Any clue? On the other hand, how can I reorganize the data in the way it was in 
the begining? I hope someone can help me on this...
Thanks in advance 

j. silva 
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