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

droplevels.ffdf {ffbase}

R Documentation

The function `droplevels` is used to drop unused levels from factors in a `ffdf`

The function droplevels is used to drop unused levels from factors in a ffdf

## S3 method for class 'ffdf'
droplevels(x, except = NULL, ..., inplace = FALSE)

`x`	`ffdf` object
`except`	specify which columns will be excluded from dropping levels
`...`	further arguments passed to `droplevels.ff`
`inplace`	if `TRUE` the columns will be physically changed, otherwise (default) new `ff` vectors will be created

ffdf object where levels of factors are dropped