[R] replicate rows

[catalin roibu]

Dear R users,

I want to replicate sampled rows in data frame. The sampling results must
be in this form:

  a   b     Rep
[1,] 3 4.0 R1
[2,] 6 8.0 R1
[3,] 1 0.1 R2
[4,] 6 8.0 R2
[5,] 1 0.1 R3
[6,] 5 7.0 R3

I have a code but I didn't succeed to insert to rep column.

This is my code:
a<-c(1,2,3,4,5,6)
b<-c(0.1, 0.2, 4, 6, 7, 8)
ab<-cbind(a, b)
x<-replicate(3, sample(1:nrow(ab), 2))
aa<-ab[x, ]

Please help me to solve that problem!

Thank you very much!

Best regards!

Catalin

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Catalin-Constantin ROIBU
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Lecturer PhD, Forestry engineer
Forestry Faculty of Suceava
Str. Universitatii no. 13, Suceava, 720229, Romania
office phone      +4 0230 52 29 78, ext. 531
mobile phone    +4 0745 53 18 01
FAX:                +4 0230 52 16 64
silvic.usv.ro <http://www.usv.ro/>

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