[R] Strange R behavior for product of two sum of integers

[peter dalgaard]

On Oct 20, 2011, at 16:50 , David Winsemius wrote:

> That does seem to be an infelicity that ought to be fixed. Using the infix addition operator does that same sort of coercions, so why would one expect the infix multiplication operator to refuse to do it?
> 
> > (sum(1000:1205))*(sum(1000:1204) +1205)
> [1] 51581223225

The addition operator doesn't either:

> (sum(1000:1205))*(sum(1000:1204) +1205L)
[1] NA
Warning message:
In (sum(1000:1205)) * (sum(1000:1204) + 1205L) :
  NAs produced by integer overflow

Beware that 1:1 is integer but 1 is not.

-- 
Peter Dalgaard, Professor
Center for Statistics, Copenhagen Business School
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Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com