randomly selecting an element without randsample

How do I randomly select an element without the machine learning toolbox function randsample?

Answer 1

[Walter Roberson]

YourData(randi(numel(YourData), SIZE))   %select SIZE elements WITH REPETITION
YourData(randperm(numel(YourData), NUMBER))  %select NUMBER elements WITHOUT REPETITION

SIZE can be a vector of values such as [5 7] to generate a 5 x 7 matrix with repetition.

NUMBER must be a positive integer scalar; reshape() afterwards if you need to.