> Le 7 mai 2026 à 11:38, Rui Barradas <[email protected]> a écrit :
>
> Às 16:16 de 07/05/2026, Vincent Goulet via R-devel escreveu:
>> Hi all,
>> ?quantile states:
>> names: logical; if true, the result has a names attribute. Set to
>> ‘FALSE’ for speedup with many ‘probs’.
>> Unless I'm missing something entirely, the "set to FALSE for speedup" part
>> appears to no longer apply. I could trace it back to the introduction of the
>> auxiliairy function 'format_perc':
>> commit cc003015a4aed96ed49b4f310209d3e75a48eeb3
>> Author: maechler <maechler@00db46b3-68df-0310-9c12-caf00c1e9a41>
>> Date: Wed Oct 15 15:55:42 2014 +0000
>> format_perc() factored out of quantile.default() + an RFC on "export"
>> I'm not sure if the intend is to modify the code to comply to the
>> documentation, or the other way around. ;-) I'm willing to prepare a patch
>> if informed.
>> HTH
>> v.
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> Hello,
>
> I cannot reproduce this on R 4.6.0 / Windows 11, see the sample run.
>
> set.seed(2026)
> quantile(rnorm(10), names = FALSE)
> # [1] -2.51608903 -0.94887840 -0.57021530 0.06397863 0.52058907
First, after closer inspection, the commit I quoted is not relevant. Please
disregard.
The more I think about it, the clearer it becomes that I read the documentation
wrong, thinking "Set to ‘FALSE’ for speedup with many ‘probs’" means "The
argument 'names' is automatically set to FALSE for long 'probs' vectors". Which
is not the case:
> quantile(rnorm(1e6), probs = seq(0, 1, len = 101))
0% 1% 2% 3% 4% 5%
6%
-4.889538417 -2.326726002 -2.051119453 -1.880294024 -1.748065447 -1.642306376
-1.552670826
[...]
The sentence would rather be an injunction: "If your vector 'probs' is long,
use 'names = FALSE' to speedup the result". The documentation is then obviously
right, although somewhat subject to interpretation. I'd propose a small
adjustment along these lines:
- attribute. Set to \code{FALSE} for speedup with many \code{probs}.}
+ attribute. Setting to \code{FALSE} with many \code{probs} speeds up
+ computations.}
Then I realize the text has been there for many years without visibly being an
issue before. ;-)
HTH/Sorry for the noise.
v.
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