[R] Permutations

[ONKELINX, Thierry]

Dear Elke,

I think you need something like this. It's only for 3 variables, but I
think you know how to expand it for more variables.

mat <- expand.grid(a = 0:4, b = 0:4, c = 0:4)
write.table(mat, file="C:/Documents and Settings/My
Documents/permutations.txt",sep=";",col.names=FALSE, row.names=FALSE)

HTH,

Thierry


------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be 
www.inbo.be 

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces op r-project.org [mailto:r-help-bounces op r-project.org]
Namens Elke Moons
Verzonden: dinsdag 13 mei 2008 9:49
Aan: r-help op r-project.org
Onderwerp: [R] Permutations

Dear R-users,





Is there an easy way to determine all possible vectors of length 21 with
each entry having permutations from 0 to 4, instead of doing it like
this?
It really takes up too much time, and I am convinced that there exists
something easier.

Can you help me? Thank you in advance! 

Kind regards,





Elke



for (a in 0:4){

for (b in 0:4){

for (c in 0:4){

for (d in 0:4){

for (e in 0:4){

for (f in 0:4){

for (g in 0:4){

for (h in 0:4){

for (i in 0:4){

for (j in 0:4){

for (k in 0:4){

for (l in 0:4){

for (m in 0:4){

for (n in 0:4){

for (o in 0:4){

for (p in 0:4){

for (q in 0:4){

for (r in 0:4){

for (s in 0:4){

for (u in 0:4){

for (v in 0:4){

vec<-list(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,u,v)

write.table(vec,file="C:/Documents and Settings/My
Documents/permutations.txt",sep=";",col.names=FALSE, row.names=FALSE,
append=TRUE)

}

}

}

}

}

}

}

}

}

}

}

}

}

}

}

}

}

}

}

}

}



____________________________

Elke Moons, PhD

Transportation Research Institute/ 

Instituut voor Mobiliteit (IMOB)

Wetenschapspark 1, bus 15

3590 Diepenbeek

BELGIUM

Tel. +32-11-26.91.26

Fax. +32-11-26.91.99

E-mail: elke.moons op uhasselt.be




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