Draw a sample of size 1 given probabilities
This uses the RcppArmadillo implementation of the sample() command to draw a sample of size 1 from 0:(n-1) given probability vector p of length n. This is used for sampling interal to an Rcpp method, and its start index is 0 to match vector indexing in C++.
Value between 1 and n
Albert Y. Kim
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