On Oct 20, 2011, at 1:45 AM, Lei Jiang wrote:
When using power operator ^, both the base and index are coerced to
type
"real". The range of "real" is larger than "integer".
However, an ordinary multiplication operator * offers it to two
integers (as
always).
So, to avoid the warning, just add "as.real(...)" to one or both
multipliers
(once one multiplier is "real", the other must be coerced to "real"
in the
operation):
sum(1000:1205)*as.real(sum(1000:1205))
[1] 51581223225
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
> (sum(1000:1205))*(sum(1000:1204) +0)
[1] 51307549650
--
David.
HTH,
Lei
On Wed, Oct 19, 2011 at 7:44 PM, Lafaye de Micheaux Pierre <
laf...@dms.umontreal.ca> wrote:
Dear gentlemen,
Can you explain me why the following happens (any OS I think, and
even on
64 bits)?
sum(1000:1205)^2
[1] 51581223225
sum(1000:1205)*sum(1000:1205)
[1] NA
Warning message:
In sum(1000:1205) * sum(1000:1205) : NAs produced by integer overflow
Best,
Pierre
--
Pierre Lafaye de Micheaux
Adresse courrier:
Département de Mathématiques et Statistique
Université de Montréal
CP 6128, succ. Centre-ville
Montréal, Québec H3C 3J7
CANADA
Adresse physique:
Département de Mathématiques et Statistique
Bureau 4249, Pavillon André-Aisenstadt
2920, chemin de la Tour
Montréal, Québec H3T 1J4
CANADA
Tél.: (00-1) 514-343-6607 / Fax: (00-1) 514-343-5700
laf...@dms.umontreal.ca
http://www.biostatisticien.eu
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--
Lei Jiang
Center for Computation and Technology/
Department of Computer Science
Louisiana State University
E-mail: lji...@cct.lsu.edu
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