noncommutative addition: NA+NaN != NaN+NA
On Tue, 2004-09-07 at 12:47, Prof Brian Ripley wrote:
On Tue, 7 Sep 2004, Robin Hankin wrote:
Check this out:
I am unable to reproduce it on any of the 7 different systems I checked (Solaris, Linux, Windows with various compilers).
NaN +NA
[1] NaN
NA + NaN
[1] NA I thought "+" was commutative by definition. What's going on?
platform powerpc-apple-darwin6.8 arch powerpc os darwin6.8 system powerpc, darwin6.8 status (Both give NA under linux, so it looks like a version-specific issue).
Linux on that hardware? It might be a chip issue.
I tried this in Linux on Mac iBook G4, and the results were the same: NaN+NA was NaN, just like in MacOS X version. So it looks like a "chip issue". However, the RPM built from the src.rpm packages at CRAN failed in some checks in Linux/iBook. cheers, jari oksanen
Jari Oksanen <jarioksa at sun3.oulu.fi>