Bert,

I have not studied the help in enough depth.  My, limited, understanding of
recursion comes from the linux command line - e.g., rm -r will remove all
files in a folder by descending (probably not the right word) into the
folder
, removing all of the files, and then removing the folder itself.

Thank you for all of the help.

Stephen


On Thu, May 30, 2013 at 11:25 PM, Bert Gunter <gunter.berton@gene.com>wrote:

> Have you studied the Help file for Recall() . (It is not clear to me
> that you have). Do you understand what recursion is? ( this is a
> simple example of it).
>
> Try constructing a very simple example and then work through what the
> code does in it step by step.
>
> I'll leave it to others to attempt a mini-tutorial beyond this.
>
> -- Bert
>
> On Thu, May 30, 2013 at 7:57 PM, Stephen Sefick <sas0025@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
> > **************************************************
> > sas0025@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
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
>
>
> --
>
> Bert Gunter
> Genentech Nonclinical Biostatistics
>
> Internal Contact Info:
> Phone: 467-7374
> Website:
>
> http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
>
>
>

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