Nothing
#' tests/fmla.R
#'
#' Manipulation of formulae
require(spatstat.utils)
#' code coverage of special cases
identical.formulae(y ~ x, NULL)
termsinformula(NULL)
offsetsinformula(y ~ x)
lhs.of.formula(~x)
rhs.of.formula(y ~ x, tilde=FALSE)
f <- ~x
lhs.of.formula(f) <- quote(y)
print(f)
can.be.formula("y ~ x")
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