f <- getFormula("gompertz")
# We need to set the parameters (N0, ..., lambda)
f2 <- f(0.1, 2, 0.2, 5)
# And we can then use the function "f(x)" with x the time
f2(4)
## [1] 0.1150952
# The same, more direct
F <- getFormula("gompertz")(0.1, 2, 0.2, 5)
F(4)
## [1] 0.1150952
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