On Fri, 15 Aug 2008, Jose Luis Aznarte M. wrote:
Hi there! I can't find any information about creating combinations with
repetitions in R. The function combn() does create combinations, but
_without_ repetitions.
Here is what I need to do:
svIter <- 1000
xx <- matrix(rnorm(m*n), c(m, n))
sequence <- seq(range(xx)[1], range(xx)[2], length.out = svIter^(1/q))
expand.grid(secuence, secuence, .../q times/..., secuence)
See
?do.call
do.call( expand.grid, rep( list(sequence), q ) )
HTH,
Chuck
p.s. Using function names as object names (e.g. 'q') is considered bad
practice
That is, I need a grid which covers a q-dimensional space with range
range(xx) for each dimension, and a total number of points close to svIter.
My problem could be solved by writting the expand.grid call at runtime, but I
think that is not very elegant and, overall, I don't know how to do that. If
combn() accepted repetitions, it'd be solved also.
Any help will be greatly appreciated.
Bests,
-- --
Jose Luis Aznarte M. http://decsai.ugr.es/~jlaznarte
Department of Computer Science and Artificial Intelligence
Universidad de Granada Tel. +34 - 958 - 24 04 67
GRANADA (Spain) Fax: +34 - 958 - 24 00 79
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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and provide commented, minimal, self-contained, reproducible code.
