Thanks for the help.  I think I have it figured out...

inside of merge dfs[-1] lops off the first element in the list and merges with dfs[[1]] then this is repeated for the entire list? With Recall inside of a function this process repeats until there are no more objects to merge?

many thanks,

Stephen

On 05/30/2013 10:02 PM, Dennis Murphy wrote:
For the general purpose of Recall, this might help:

http://rfunction.com/archives/364

It's typically used in recursive function definitions - e.g., the
Fibonacci series.

Dennis

On Thu, May 30, 2013 at 7:57 PM, Stephen Sefick <sas0...@auburn.edu> wrote:
merge_recurse
function (dfs, ...)
{
     if (length(dfs) == 2) {
         merge(dfs[[1]], dfs[[2]], all = TRUE, sort = FALSE, ...)
     }
     else {
         merge(dfs[[1]], Recall(dfs[-1]), all = TRUE, sort = FALSE,
             ...)
     }
}

I do not understand how the Recall part of this function works.  Could
somebody explain this to me?
many thanks,


--
Stephen Sefick
**************************************************
Auburn University
Biological Sciences
331 Funchess Hall
Auburn, Alabama
36849
**************************************************
sas0...@auburn.edu
http://www.auburn.edu/~sas0025
**************************************************

Let's not spend our time and resources thinking about things that are so
little or so large that all they really do for us is puff us up and make us
feel like gods.  We are mammals, and have not exhausted the annoying little
problems of being mammals.

                                 -K. Mullis

"A big computer, a complex algorithm and a long time does not equal
science."

                               -Robert Gentleman

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