[Rd] seq.Date bug?

Dirk Eddelbuettel edd at debian.org
Tue Jan 31 21:50:07 CET 2012

On 31 January 2012 at 15:28, Sarah Goslee wrote:
| As Duncan pointed out, this is documented in ?seq.POSIXt:
|      Using ‘"month"’ first advances the month without changing the day:
|      if this results in an invalid day of the month, it is counted
|      forward into the next month: see the examples.
| But ?seq.Date gives the impression that the construct Dirk and I tried
| should work:
|      ## find all 7th of the month between two dates, the last being a 7th.
|      st <- as.Date("1998-12-17")
|      en <- as.Date("2000-1-7")
|      ll <- seq(en, st, by="-1 month")
|      rev(ll[ll > st & ll < en])
| is given as an example, and it is not pointed out that this won't work for
| the 30th of the month. Normally one can extrapolate from patterns given
| in the examples, and here that isn't true. So perhaps the help should
| be modified slightly instead?

Yup, that would indeed help with this "infelicity".


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dark to read." -- Groucho Marx

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