remove_constant: Remove constant columns from a data.frame or matrix.

Description Usage Arguments See Also Examples

View source: R/remove_empties.R

Description

Remove constant columns from a data.frame or matrix.

Usage

1
remove_constant(dat, na.rm = FALSE, quiet = TRUE)

Arguments

dat

the input data.frame or matrix.

na.rm

should NA values be removed when considering whether a column is constant? The default value of FALSE will result in a column not being removed if it's a mix of a single value and NA.

quiet

Should messages be suppressed (TRUE) or printed (FALSE) indicating the summary of empty columns or rows removed?

See Also

remove_empty() for removing empty columns or rows.

Other remove functions: remove_empty()

Examples

1
2
3
4
5
6
remove_constant(data.frame(A=1, B=1:3))

# To find the columns that are constant
data.frame(A=1, B=1:3) %>%
  dplyr::select_at(setdiff(names(.), names(remove_constant(.)))) %>%
  unique()

Example output

Attaching package: 'janitor'

The following objects are masked from 'package:stats':

    chisq.test, fisher.test

  B
1 1
2 2
3 3
  A
1 1

janitor documentation built on Jan. 5, 2021, 9:07 a.m.