merge
l1ce
merge.formula(x, y, ...)
merge.formula(y ~ x1, ~ x2) ## -> y ~ x1 + x2 f2 <- merge.formula(y ~ x1*x2, z ~ (x2+x4)^3) f. <- merge.formula(y ~ x1*x2, ~ (x2+x4)^3) # no LHS for 2nd term f2 stopifnot(f2 == f.)
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