[Rd] Weird issue when iterating through dates

William Dunlap wdunlap at tibco.com
Thu Aug 6 16:55:37 CEST 2015


>> Just a quick question: what's the difference between  `[.Date` and
`[[.Date`?
>> Is it supposed to be the method for accessing the value right?
>
>For Dates and atomic vectors in general they are the same, but ...

Even for atomic vectors with names they are not quite the same
    > c(One=1, Two=2)[[2]]
    [1] 2
    > c(One=1, Two=2)[2]
    Two
      2
(and [[ will only return 1 item, unlike [).


Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Thu, Aug 6, 2015 at 5:36 AM, Gábor Csárdi <csardi.gabor at gmail.com> wrote:

> On Thu, Aug 6, 2015 at 6:30 AM, Luca Cerone <luca.cerone at gmail.com> wrote:
> [...]
> > Just a quick question: what's the difference between  `[.Date` and
> `[[.Date`?
> > Is it supposed to be the method for accessing the value right?
>
> For Dates and atomic vectors in general they are the same, but in
> general they are two different operators that behave differently on
> some data types. E.g. on lists [ selects a sub-list and [[ selects a
> single element.
>
> Gabor
>
> [...]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

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