Range values in a named list

Generate a named list that specifies a range for parameter selection in hanaml.train.

hanaml.range(start, stop, step = NULL)

Arguments

start	`numeric` Specifies the start value of a range.
stop	`numeric` Specifies the stop value(i.e. end) of a range.
step	`numeric, optional`] Specifies the step of a range. Unnecessary and ineffective when `param.search.strategy` is set to "random".

A named list that specifies a range with start value, increment(step, omitted if not provided) and stop value.