On 02/01/2011 05:16 PM, Phil Spector wrote:
> In what way is the behavior non-consistent? Quoting from
> the help page for rep:
>
> ¡times¢ A vector giving the number of times to repeat each
> element if of length ¡length(x)¢, or to repeat the whole
> vector if of length 1.
>
> ¡each¢ non-negative integer. Each element of ¡x¢ is repeated
> ¡each¢ times. Treated as ¡1¢ if ¡NA¢ or invalid.
>
> So while times may be a vector, each is clearly limited to being an
> integer. I'll admit that it would be nice if it told you that it
> was only using the first element of a vector each argument, but the
> behaviour is perfectly consistent with the documentation.
>
If you read the documentation carefully, you'll see it's not consistent,
though not for the reason the original poster may have meant. Following
the documentation, 'each' should be a non-negative integer. Given that
the paragraph immediately above is explicit about the input being a
vector, it's rather obvious to expect that vector is not a valid
argument for 'each'.
Just as
rep(1:2, each=-1)
is an error from invalid argument, so one might wish
rep(1:2, each=c(1,2))
were too, instead of silently doing the arguably wrong thing.
The funny part that
is.integer(2)
# FALSE
tells you 2 is not a good value for 'each' is another story.
vQ
> - Phil Spector
> Statistical Computing Facility
> Department of Statistics
> UC Berkeley
> [email protected]
>
>
>
> On Tue, 1 Feb 2011, T.D. Rudolph wrote:
>
>>
>> I have a vector of unique elements that I want to replicate a
>> variable number
>> of times depending on the element (lengths all > 800). However I
>> noticed
>> that the resulting length was not the sum of the each argument. The
>> following example demonstrates this.
>>
>> I am confused as to why this works:
>>
>> rep(1:4, c(2,1,2,1))
>> [1] 1 1 2 3 3 4
>>
>> but this doesn't:
>>
>> rep(1:3, each=c(2,1,2))
>> [1] 1 1 2 2 3 3
>>
>> This does not appear to be consistent with the description provided in
>> ?rep....
>> Is this supposed to be happening?
>> --
>> View this message in context:
>> http://r.789695.n4.nabble.com/each-argument-in-rep-Bug-tp3253050p3253050.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
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>> PLEASE do read the posting guide
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>>
>
> ______________________________________________
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