[R] Automated generation of combinations
Hello, I'd like to generate automatically all the possible combinations of a set of 8 variables (there are 535, too many to do it by hand). For example: input: varA, varB, varC output: varA+varB+varC varA+varB varA+varC varB+varC varA varB varC Is there any function that produces this option? Thank you [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Automated generation of combinations
one option is the following:
varNames - c(varA, varB, varC, varD)
f - function (i) {
combn(length(varNames), i,
function (x) paste(varNames[x], collapse = + ))
}
lapply(seq_along(varNames), f)
However, in case you're interested in performing a linear regression
with these subsets, then have also a look at package leaps
(http://CRAN.R-project.org/package=leaps).
Best,
Dimitris
On 9/12/2011 11:20 AM, Santiago Guallar wrote:
Hello,
I'd like to generate automatically all the possible combinations of a set of 8
variables (there are 535, too many to do it by hand). For example:
input: varA, varB, varC
output: varA+varB+varC
varA+varB
varA+varC
varB+varC
varA
varB
varC
Is there any function that produces this option?
Thank you
[[alternative HTML version deleted]]
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
Web: http://www.erasmusmc.nl/biostatistiek/
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Automated generation of combinations
Try this ltr-LETTERS[1:3] unique(apply(expand.grid(ltr,ltr,ltr),1,function(x) paste(Var,unique(sort(x)),collapse=+,sep=))) [1] VarA VarA+VarB VarA+VarC VarA+VarB+VarC VarB VarB+VarC VarC Andrej -- Andrej Blejec National Institute of Biology Vecna pot 111 POB 141, SI-1000 Ljubljana, SLOVENIA e-mail: andrej.ble...@nib.si URL: http://ablejec.nib.si tel: + 386 (0)59 232 789 fax: + 386 1 241 29 80 -- Organizer: Applied Statistics 2011 conference http://conferences.nib.si/AS2011 -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Santiago Guallar Sent: Monday, September 12, 2011 2:45 PM To: r-help@r-project.org Subject: [R] Automated generation of combinations Hello, I'd like to generate automatically all the possible combinations of a set of 8 variables (there are 535, too many to do it by hand). For example: input: varA, varB, varC output: varA+varB+varC varA+varB varA+varC varB+varC varA varB varC Is there any function that produces this option? Thank you [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
