Generate a set of random unique integers from an interval

Question

I am trying to build some machine learning models,

so i need a training data and a validation data

so suppose I have N number of examples, I want to select rando

Answer 1

sample (or sample.int) does this:

sample.int(100, 10)
# [1] 58 83 54 68 53  4 71 11 75 90

will generate ten random numbers from the range 1–100. You probably want replace = TRUE, which samples with replacing:

sample.int(20, 10, replace = TRUE)
# [1] 10  2 11 13  9  9  3 13  3 17

More generally, sample samples n observations from a vector of arbitrary values.