# [R] scoping issues?

Barry Rowlingson B.Rowlingson at lancaster.ac.uk
Thu Dec 8 19:38:42 CET 2005

```tom wright wrote:

> Browse[1]> mean(amps[1],amps[2],amps[3],amps[7],amps[8])
> [1] 1

For starters, this just returns mean(amps[1]). 'mean' computes the
mean of the first argument, the others are slurped up by '...' and in
this case thrown into the bin. You want to do
mean(c(amps[1],amps[2],amps[3] and so on. Wrap them into a single vector.

For main course, I think you can do it like this:

getAR <- function(v.amps){
sv=sort(v.amps)
sum(sv[1:3])/mean(sv[-(1:3)])
}

- which computes the ratio of the sum of the three biggest over the
mean of the remainder. Which I think is what your code looks like its
trying to do!

An example input/output would be nice. My code gives:

> amps<-c(1,2,3,3,3,2,1)
> getAR(amps)
[1] 1.454545

but I still dont know if that's what it should be!

For dessert, I don't think its a scoping issue, I think you've not
really explained what the problem is...

Baz

```