Randomly select records given a probability weight vector prob.
NOTE: This is an internal function used for testing the C++-function randSample which is used inside the C++-function recordSwap().

randSample_cpp(ID, N, prob, IDused, seed)

## Arguments

ID

vector containing record IDs from which to sample

N

integer defining the number of records to be sampled

prob

a vector of probability weights for obtaining the elements of the vector being sampled.

IDused

vector containing IDs which must not be sampled

seed

integer setting the sampling seed