[R] do.call("+", ...)

[Prof Brian Ripley]

On Fri, 17 Nov 2006, Duncan Murdoch wrote:

[...]

> By the way, another complaint is that sum() is supposed to be generic,
> but you can't define a sum.matrix() method so that sum(a,b,c) does the
> same as a+b+c when a is a matrix.  (This would probably be a bad idea
> because people may be relying on the current behaviour, but R tries not
> to prevent people from testing out bad ideas.)

In this case it does, and this is as documented in ?Summary, referred to 
from ?sum.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595