# datatable.FExpr.remove()¶

Remove columns arg from the current FExpr.

Each FExpr represents a collection of columns, or a columnset. Some of those columns are computed while others are specified “by reference”, for example f.A, f[:3] or f[int]. This method allows you to remove by-reference columns from an existing FExpr.

## Parameters¶

arg
FExpr

The columns to remove. These must be “columns-by-reference”, i.e. they cannot be computed columns.

return
FExpr

New FExpr which is a obtained from the current FExpr by removing the columns in arg.