Martin Maechler <email@example.com>
Mon, 5 Jan 1998 08:49:12 +0100
[spill over from R-core]
>>>>> "TL" == Thomas Lumley <firstname.lastname@example.org> writes:
TL> On Sun, 4 Jan 1998, Kurt Hornik wrote:
>> Another thing I noticed when playing with chron is that apparently
>> code like if (!(length(value)) works in S but not in R. The error
>> in R is unary ! is only defined for logical vectors
>> I assume that this is a bug and not a feature (although the code in
>> src/main/logic.c makes me wonder ...).
TL> I complained about this more than a year ago and I thought we (or
TL> in those days R+R) had decided it was a feature -- I just explained
TL> to someone on r-help that it was one of the deliberate
TL> incompatibilities that ! didn't work on numerics.
Yes, positively. We've discussed this quite a bit, and
this was defined to be a feature long ago.
The proper (non C-hacker but normal-user readable) way is to test for
if(length(vector) == 0)
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