you could try something like the following:
groups <- list(gp1 = 1:3, gp2 = 4:5, gp3 = 6:7,
gp4 = 8:10, gp5 = 11)
combn(5, 2, function (x) expand.grid(groups[x]), simplify = FALSE)
combn(5, 3, function (x) expand.grid(groups[x]), simplify = FALSE)
combn(5, 4, function (x) expand.grid(groups[x]), simplify = FALSE)
I hope it helps.
Best,
Dimitris
David Scott wrote:
I have been struggling trying to write some code to produce all
combinations subject to some restrictions. I thought someone might have
some bright ideas.
I have 11 values which fall into 5 groups. I want all combinations of
2,3, and 4 values where each value must be from a different group. The
numbers in the groups are different. Here is a definition of the groups:
groups <- list(gp1 = 1:3, gp2 = 4:5, gp3 = 6:7,
gp4 = 8:10, gp5 = 11)
I don't need the problem to be generalized at all---I just want to solve
this problem.
My approach so far has been to use combinations() from gtools to select
the combinations of groups and then to try and expand from there. I am
nearly there I think but it seems excessively complicated. I can
definitely do the all combinations of 2 from 11 subject to the group
restriction.
Suggestions are most welcome.
David Scott
_________________________________________________________________
David Scott Department of Statistics
The University of Auckland, PB 92019
Auckland 1142, NEW ZEALAND
Phone: +64 9 923 5055, or +64 9 373 7599 ext 85055
Email: d.sc...@auckland.ac.nz, Fax: +64 9 373 7018
Director of Consulting, Department of Statistics
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--
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
______________________________________________
R-help@r-project.org mailing list
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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.
