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Remove constant columns from a data.frame or matrix.

Usage

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

remove_constant(data.frame(A=1, B=1:3))
#>   B
#> 1 1
#> 2 2
#> 3 3

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