Rcpp_combn_zerostart: Get all the combinations of descendent state pairs, in...

Description Usage Arguments Details Value Author(s) References See Also Examples

Description

Given the number of states, this function returns all of the pairs of indexes corresponding to those states.

Usage

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  Rcpp_combn_zerostart(n_to_choose_from, k_to_choose,
    maxlim = 1e+07)

Arguments

n_to_choose_from

N in N choose K

k_to_choose

K in N choose K

maxlim

To avoid memory overruns, the number of combinations can be no larger than maxlim (default: 1e+07)

Details

The C++ version is MUCH faster than the plain-R version.

Value

outarray an integer matrix with outarray rows; the number of columns is the number of combinations.

Author(s)

Nicholas Matzke matzke@berkeley.edu

References

Matzke N (2012). "Founder-event speciation in BioGeoBEARS package dramatically improves likelihoods and alters parameter inference in Dispersal-Extinction-Cladogenesis (DEC) analyses." _Frontiers of Biogeography_, *4*(suppl. 1), pp. 210. ISSN 1948-6596, Poster abstract published in the Conference Program and Abstracts of the International Biogeography Society 6th Biannual Meeting, Miami, Florida. Poster Session P10: Historical and Paleo-Biogeography. Poster 129B. January 11, 2013, <URL: http://phylo.wikidot.com/matzke-2013-international-biogeography-society-poster>.

See Also

rcpp_calc_anclikes_sp, rcpp_mult2probvect, rcpp_convolve

Examples

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Rcpp_combn_zerostart(n_to_choose_from=4, k_to_choose=2, maxlim=1e+07)
Rcpp_combn_zerostart(n_to_choose_from=4, k_to_choose=3, maxlim=1e+07)


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