Should the algorithm talk (logical, default to TRUE)
Value
List of column's indexes that are constant in the dataSet set.
Details
Algorithm is constance equality by exponential search: it check constance on row 1 to 10,
if it's ,not constant it stops, if it's constant then on 11 to 100 ...
If you have a lot of columns than aren't constant, this function is way faster than a simple
length(unique())! The larger the dataSet set is, the more interesting it is to use this function.
# NOT RUN {# Let's load our dataSetdata("messy_adult")
# Lets try our functionwhichAreConstant(messy_adult)
# Indeed it return constant the name of the constant column.# }