Remove constant columns from a data.frame or matrix.

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