R rename columns by using third table : <p>My problem:
Ive got 3 tables: 2 with obs. and variables.
The variables of those two tables have diffenrent names, but describe the same thing. So I want to rename the variables in one table, to than merge them together without doubleing the amount of variables.
The third table is a table which contains the names of both variables, always the two matchings in a row.</p>

<p>How can I rename on tables variables using table #3?
Or else can I join/merge them directly using table #3</p>
