Last data update: 2014.03.03
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R: Recursively apply a permutation
Recursively apply a permutation
Description
Recursively apply a permutation to a vector an arbitrary number of
times. Negative times mean apply the inverse permutation.
Usage
recurse(perm, i, start = seq_along(perm))
Arguments
perm |
Permutation (integers 1 to length(start) in some order)
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start |
Start vector to be permuted
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i |
Number of times to apply the permutation. i=0 gives
start by definition and negative values use the inverse
permutation
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Author(s)
Robin K. S. Hankin
See Also
hudson
Examples
n <- 15
noquote(recurse(start=letters[1:n],perm=shift(1:n),i=0))
noquote(recurse(start=letters[1:n],perm=shift(1:n),i=1))
noquote(recurse(start=letters[1:n],perm=shift(1:n),i=2))
noquote(recurse(start=letters[1:n],perm=sample(n),i=1))
noquote(recurse(start=letters[1:n],perm=sample(n),i=2))
Results
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