R: The function 'droplevels' is used to drop unused levels from...

droplevels.ff {ffbase}

R Documentation

The function `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 class 'ff'
droplevels(x, ..., inplace = FALSE)

`x`	`ff` object
`...`	not used
`inplace`	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