Dear Professor Ripley
thank you for your reply.
> NaN +NA [1] NaN > NA + NaN [1] NA
I thought "+" was commutative by definition. What's going on?
It is clearly not under your compiler/OS. We could add a configure test for broken systems and fix it in arithmetic.c but it hardly seems worthwhile.
[snip]
> (Both give NA under linux, so it looks like a version-specific issue).
Linux on that hardware? It might be a chip issue.
Sorry, that should read "Both give NA under linux on an i686 system, RedHat Linux 2.4.18"
In any event, "+" appears to be associative (which is what I was interested in).
best wishes
rksh
-- Robin Hankin Uncertainty Analyst Southampton Oceanography Centre SO14 3ZH tel +44(0)23-8059-7743 [EMAIL PROTECTED] (edit in obvious way; spam precaution)
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