drop1val: Drop attributes (columns) that only take single values for a...

In 42n4/dmr.util: A package with utility functions used in the book Cichosz, P. (2015): Data Mining Algorithms: Explained Using R

Description

This function drops data columns that only take a single value for all rows. It is used in examples presented in the book Cichosz, P. (2015): Data Mining Algorithms: Explained Using R. See Appendix B or http://www.wiley.com/go/data_mining_algorithms for more details.

Usage

drop1val(cnames, data)

Arguments

cnames	a character vector of column names to use
data	a dataframe

Details

All columns with names not included in cnames or taking only a single unique value for all rows of data are dropped and the names of the remaining columns are returned.

Value

A vector of column names that appear in cnames and take at least 2 unique values in data.

Author(s)

Pawel Cichosz <[e-mail]>

Examples

data(weather, package="dmr.data")

drop1val(names(weather), weather[1:3,])
drop1val(names(weather), weather[4:6,])

42n4/dmr.util documentation built on May 20, 2019, 2:02 p.m.