Any help is very much appreciated. The following is a toy example:
> #1. Create a data frame with two named columns (x,y):
> DF <- data.frame(cbind(x=1:5, y=6:10))
> DF
x y
1 1 6
2 2 7
3 3 8
4 4 9
5 5 10
> #2. Define a function to compute the sum of a given column:
> foo.fnc = function(i){
+ return(sum(DF[ ,i]))
+ }
>
> #3. Call the function to get the mean of column 1, for example:
> foo.fnc(1)
[1] 15
>
> # Now, what I really want is to be able to use a column name as the
> argument
> # That is, something like:
>
> # foo.fnc = function(colname)
> # And calling it:
> # foo.fnc(DF$x)
> #How would I set up this syntax?
> #Thanks very much in advance.
> # - Ben -
>
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