randsampleind¶

randsampleind(n, k, varargin)

RANDSAMPLEIND Random sample, with or without replacement, RETURNS INDICES. Y = RANDSAMPLE(N,K) returns Y as a column vector of K values sampled uniformly at random, without replacement, from the integers 1:N.

Y = RANDSAMPLE(POPULATION,K) returns K values sampled uniformly at random, without replacement, from the values in the vector POPULATION. Y is a vector of the same type as POPULATION. NOTE: When POPULATION is a numeric vector containing only non-negative integer values, and it might have length 1, use

Y = POPULATION(RANDSAMPLE(LENGTH(POPULATION),K)

instead of Y = RANDSAMPLE(POPULATION,K).

Y = RANDSAMPLE(N,K,REPLACE) or RANDSAMPLE(POPULATION,K,REPLACE) returns a sample taken with replacement if REPLACE is true, or without replacement if REPLACE is false (the default).

Y = RANDSAMPLE(N,K,true,W) or RANDSAMPLE(POPULATION,K,true,W) returns a weighted sample, using positive weights W, taken with replacement. W is often a vector of probabilities. This function does not support weighted sampling without replacement.

Y = RANDSAMPLE(S,…) uses the random number stream S for random number generation. RANDSAMPLE uses the MATLAB default random number stream by default.

Examples:

Draw a single value from the integers 1:10.: n = 10; x = randsample(n,1);
Draw a single value from the population 1:n, when n > 1.: y = randsample(1:n,1);

Generate a random sequence of the characters ACGT, with replacement, according to specified probabilities.

R = randsample(‘ACGT’,48,true,[0.15 0.35 0.35 0.15])