CODEWITHSUNDEEP
rrcpp
Sacha Epskamp
Sacha Epskamp

Reputation: 47551

Sample a random integer in Rcpp

This might be a very easy question, but I can't really find it. How can I sample a random integer between 1 and N in Rcpp? I know I can sample a uniform number and round it, or include the sample function to use in the C++ code, but both don't seem like the correct way of doing this.

Upvotes: 9

Views: 2867

Answers (1)

Dirk is no longer here
Dirk is no longer here

Reputation: 368201

  1. AFIACR we do not have a "decent" (ie vectorised) sample() function in Rcpp-land, but Christian Gunning is working on one based on Armadillo via RcppArmadillo.

  2. You can of course sample from U(0,1), scale to N and to the rest. We have R::runif() for the scalar case and runif() in sugar which is vectorised.

Edit: As of 2017, both RcppArmadillo and Rcpp now have a sample() function.

Upvotes: 8

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