>>>>> "Marcus" == Marcus Davy <[EMAIL PROTECTED]>
>>>>> on Thu, 09 Dec 2004 11:38:29 +1300 writes:
Marcus> Bringing up an old topic on a small technicality.
Marcus> In the help documentation on seq()
>> Value:
>> The result is of 'mode' '"integer"' if 'from' is (numerically
>> equal to an) integer and 'by' is not specified.
Marcus> The arguement in seq specifying length also creates
Marcus> "double" which is not obvious in the wording, as
Marcus> "by" is not specified but the object is double.
>> typeof(seq(from=1, length=1))
Marcus> [1] "double"
yes, thank you, Marcus!
Actually the situation is a bit more complicated and I'm
currently looking at the (not yet committed) version
\value{
The result is of \code{mode} \code{"integer"} if \code{from} is
(numerically equal to an) integer and, e.g., only \code{to} is specified.
% MM: to specify all the conditions doesn't seem worth, nor should the
% code be changed just for docu.purposes; e.g. str(seq(from=1:1, to=8,
by=3:3))
}
Martin
>>>> Martin Maechler <[EMAIL PROTECTED]> 3/08/2004 3:15:45 AM >>>
>>>>> "Georgi" == Georgi Boshnakov <[EMAIL PROTECTED]>
>>>>> on Mon, 2 Aug 2004 15:46:37 +0100 writes:
Georgi> Hi, I wonder if the following (apparent)
Georgi> inconsistency is a bug or feature.
Marcus> a feature "of course".
Georgi> Since scalars are simply vectors of length one I
Georgi> would think that a and a:a produce the same result.
Marcus> Why would you?
Marcus> Have you read the documentation for ":" carefully?
Marcus> {Part this topic, namely that a numeric constant such as "4"
Marcus> is a "double" in R (but integer in S-plus since S+5.0)
Marcus> should probably finally end up in the R FAQ ...
Marcus> }
Marcus> Regards, Martin Maechler
Georgi> For example,
>>> identical(4.01,4.01:4.01)
Georgi> [1] TRUE
Georgi> However,
Georgi> identical(4,4:4)
Georgi> [1] FALSE
Georgi> and
>>> identical(4.0,4.0:4.0)
Georgi> [1] FALSE
Georgi> A closer look reveals that the colon operator produces objects of
different class, e.g.
Marcus> a closer look wouldn't have been necessary had you read and
Marcus> understood the documentation.
>>> class(4)
Georgi> [1] "numeric"
>>> class(4.0)
Georgi> [1] "numeric"
Georgi> but
>>> class(4:4)
Georgi> [1] "integer"
>>> class(4.0:4.0)
Georgi> [1] "integer"
Georgi> Georgi Boshnakov
Georgi>
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