This is method for formulas of the merge generic function. Here it is support for the function l1ce and not intended to be called directly by users.
merge
l1ce
# S3 method for formula merge(x, y, …)
formulas.
potentially further arguments passed to methods.
# NOT RUN { merge(y ~ x1, ~ x2) ## -> y ~ x1 + x2 f2 <- merge(y ~ x1*x2, z ~ (x2+x4)^3) f. <- merge(y ~ x1*x2, ~ (x2+x4)^3) # no LHS for 2nd term f2 stopifnot(f2 == f.) # }
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