ffbase: droplevels.ffdf – R documentation

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droplevels.ffdf

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