datatable.FExpr.extend()

datatable.FExpr.

extend

(

arg

)

source

Append FExpr arg to the current FExpr.

Each FExpr represents a collection of columns, or a columnset. This method takes two such columnsets and combines them into a single one, similar to cbind().

Parameters

arg

FExpr

The expression to append.

return

FExpr

New FExpr which is a combination of the current FExpr and arg.

See also

• remove() – remove columns from a columnset.