The Select function selects the items data[i] for which  returns true, and creates a new data sample with the same options as X. Those items for which func does not return true are discarded in the newly created data sample.

The first parameter func must be a boolean valued procedure.

The second parameter X is a data sample which must given as an Array or a list.

The Remove function does the opposite of Select. It removes the data items of X which satisfy func and creates a new data set.