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rconcatenation
Michael Gruenstaeudl
Michael Gruenstaeudl

Reputation: 1793

Concatenation of formulae in R

Function constrain of the R package diversitree takes a list of formulae as input.

formulae <- list(lambda1 ~ lambda0, mu1 ~ mu0, q10 ~ q01)
constrain(lik, formulae=formulae)

I would like to pass these formulae via a decision tree and concatenate them as needed.

f1 <- "lambda1 ~ lambda0"
f2 <- "mu1 ~ mu0"
f3 <- "q10 ~ q01"

How do I arrive at the above-shown list formulae?

Unsuccessful attempt:

formulae <- as.formula(paste(f1,f2,f3, collapse=","))

EDIT 1:

I do not know the precise number of respective formulae a prior, but let them be determined via a decision tree. The precise number of individual formulae (i.e., f1, f2, f3, etc.) that goes into variable formulae should thus not be hard-coded.

Upvotes: 2

Views: 1286

Answers (1)

Zheyuan Li
Zheyuan Li

Reputation: 73385

You can use:

formulae = list(as.formula(f1),as.formula(f2),as.formula(f3))

If you originally have all string formulae in a vector, say f <- c(f1, f2, f3), you may use

lapply(f, as.formula)

Upvotes: 2

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