Good Evening, I would like to work with multivariate polynomials (x and y variables). I know that there is a package called multipol but I am not sure that supports my needs. I use a function (in reality legendre.polynomials) which creates me the polynomials I want. For example the following returns> legendre.polynomials(2)[[2]]x (first order polynomial) I would like to calculate the polynomials with variable x with the polynomials with variable y. I do not know how I can do that in R as my function always returns output with x. Is it possible to change variable x with y? Regards Alex