Re: [Rd] proposed change to 'sample'

From: Peter Dalgaard <pdalgd_at_gmail.com>
Date: Mon, 21 Jun 2010 00:11:36 +0300

William Dunlap wrote:

>> -----Original Message-----
>> From: r-devel-bounces_at_r-project.org 
>> [mailto:r-devel-bounces_at_r-project.org] On Behalf Of Patrick Burns
....
>>
>> I propose adding an argument that allows
>> the user (programmer) to avoid that
>> ambiguity:
>>
>> function (x, size, replace = FALSE, prob = NULL,
>>      max = length(x) == 1L && is.numeric(x) && x >= 1)

>
> S+'s sample() has an argument 'n' to achieve
> the same result. It has been there since at
> least 2005 (S+ 7.0.6). sample(n=n) means to
> return a sample from seq_along(n), where n must
> be a scalar nonnegative integer. sample(x=x)
> retains it old ambiguous meaning.
> sample(x, size = n, replace = F, prob = NULL, n = NULL, ...)

Hmm, that doesn't really solve the issue does it? I.e., you still cannot conveniently sample from a vector that is possibly of size 1.

I would be more inclined to make sampling from a vector the normal case, and default x to say 1:max(n, size), forcing users to say sample(n=5) if sampling from x=1:5 is desired. This could be a manageable change; the deprecation sequence is a bit painful to think through, though.

-- 
Peter Dalgaard
Center for Statistics, Copenhagen Business School
Phone: (+45)38153501
Email: pd.mes_at_cbs.dk  Priv: PDalgd_at_gmail.com

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