add_from_x function

Add a variable from one of the data sets to pairs

add_from_x(pairs, variable, new_variable = variable, ...)

add_from_y(pairs, variable, new_variable = variable, ...)

Arguments

• pairs: data.table with pairs. Should contain the columns .x and .y.
• variable: name of the variable that should be added
• new_variable: optional variable name of the new variable in pairs. When omitted variable is used.
• ...: other parameters are passed on to compare_vars. Especially inplace, x and y might be of interest.

Returns

Returns the pairs with the column added. When inplace = TRUE

pairs is returned invisibly and the original pairs is modified.