droplevels
is used to drop unused levels from a ff
factor or , more commonly, from factors in a ffdf
The function droplevels
is used to drop unused levels from a ff
factor or , more commonly, from factors in a ffdf
# S3 method for ff
droplevels(x, ..., inplace = FALSE)
ff
object
not used
if TRUE
the columns will be physically changed,
otherwise (default) a new ff
vector will be created
ff
object where levels of factors are dropped