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# Deparse into a single string
deparse0 <- function(formula) paste(trimws(deparse(formula)),collapse=" ")
# Concatenate two formulae
c_formulae <- function(formula,extra){
formula.deparsed <- deparse0(formula)
extra.deparsed <- sub("~","+",deparse0(extra))
as.formula(paste(formula.deparsed,
extra.deparsed),
env=environment(formula))
}
# Check if formula
is_formula <- function(x)inherits(x,"formula")
# Subtitute "|" with "+"
random2formula <- function(r) {
formula.deparsed <- deparse0(r$formula)
gf <- paste(r$groups,collapse="+")
as.formula(paste(formula.deparsed,
gf,sep="+"),
env=environment(r$formula))
}
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