From: David Smith [mailto:dsmith@insightful.com]
From: Prof Brian Ripley If you use integers you need to be aware of the consequences. It's a feature not a bug.
Perhaps, but maybe a more useful feature would be to signal to the user
when
such an overflow occurs? Sv4 does this by returning NA for overflow
integer
results:
a <- (1:1000) b <- (1:1000) sum(a * a) * sum(b * b)
[1] NA When this was introduced in S-PLUS 5, we discovered some overflow errors
we
were previously unaware of in S-PLUS (by noticing NAs in the results).
This is a first step in the right direction. I think that having overflows generate of NA's should be augmented by a warning or an error message. Thus we would get something like:
a <- (1:1000) b <- (1:1000) sum(a * a) * sum(b * b)
Warning messages:
Integer overflow produced NA's in: .Primitive("*")
[1] NA
Now, the problem will be clear to the user, and many users will immediately see how to get around it. -Greg LEGAL NOTICE Unless expressly stated otherwise, this message is confidential and may be privileged. It is intended for the addressee(s) only. Access to this E-mail by anyone else is unauthorized. If you are not an addressee, any disclosure or copying of the contents of this E-mail or any action taken (or not taken) in reliance on it is unauthorized and may be unlawful. If you are not an addressee, please inform the sender immediately. -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._