CODEWITHSUNDEEP
rfunctionvectorapply
SteveK
SteveK

Reputation: 53

Apply a multi-variable function to a vector in R

I would like to define an arbitrary function of an arbitrary number of variables, for example, for 2 variables:

func2 <- function(time, temp) time + temp

I'd like to keep variable names that have a meaning in the problem (time and temperature above).

If I have a vector of values for these variables, for example in the 2-d case, c(10, 121), I'd like to apply my function (func2 here) and obtain the result. Conceptually, something like,

func2(c(10,121))

becomes

func2(10,121)

Is there a simple way to accomplish this, for an arbitrary number of variables?

Thanks

Upvotes: 0

Views: 139

Answers (2)

Vlo
Vlo

Reputation: 3188

Is this what you are looking for?

f = function(f,...) {
  v = list(...)
  Reduce(f, v)
}

> f(f = "+", x = pi, y = exp(1), z = pi^2)
15.72948

Upvotes: 0

MrFlick
MrFlick

Reputation: 206167

You could write a helper function to turn a simple vector into parameters with the help of do.call

splat <- function(f,v) {
    do.call(f, as.list(v))
}

splat(func2, c(10,121))

Upvotes: 1

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