Passing optional arguments inside a wrapper function to a sub-function

Question

I have a wrapper function, where I need to pass optional arguments to the sub-function specified. But there are so many different possible sub-functions that I can't pre-specify them. For reference, the sub-functions exist in the environment etc... Consider:

funInFun<- function (x, method, ...) {    

  method.out <- function(this.x, FUN, ...) {
    FUN <- match.fun(FUN)
    c <- FUN(this.x, ...)
    return(c)
  }

  d <- method.out(x, method)
  return(d)
}

data<-seq(1,10)
funInFun(data, mean) #  Works

data<-c(NA,seq(1,10))
funInFun(data, mean, na.rm=TRUE) # Should remove the NA

funInFun(c(seq(1,10)), quantile, probs=c(.3, .6))  # Shoudl respect the probs option. 

Answer 1

You need to pass the ... to method.out. Then it works fine:

funInFun<- function (x, method, ...) {    

  method.out <- function(this.x, FUN, ...) {
    FUN <- match.fun(FUN)
    c <- FUN(this.x, ...)
    return(c)
  }

  d <- method.out(x, method, ...)  # <<--- PASS `...` HERE
  return(d)
}

data<-seq(1,10)
funInFun(data, mean) #  Works
# [1] 5.5    

data<-c(NA,seq(1,10))
funInFun(data, mean, na.rm=TRUE) # Should remove the NA
# [1] 5.5

funInFun(c(seq(1,10)), quantile, probs=c(.3, .6)) 
# 30% 60% 
# 3.7 6.4