Yes, this is intentional, but it could certainly be changed. On Fri, Jun 20, 2014 at 6:28 PM, Douglas Bates <[email protected]> wrote:
> The formula language for statistical models in the DataFrames package is > patterned on a similar language in R. Several operators including :+, :*, > :& and :/ has a special interpretation in that language. In particular A & > B & C denotes a 3-way interaction. I have noticed that it does not > generate a three-argument call to the & function but instead generates a > two-argument call to & in which the first argument is a call to & with > arguments A and B. Is this intentional? > > I can work around this but it seems that the 3 argument call is legitimate. > > julia> eval(Expr(:call,:&,true,false,true)) > false >
