[R] Converting strings to date
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Nov 8 21:18:16 CET 2004
You want as.Date, not strptime that gives you a *list*.
Please do read the help pages before posting, as the the posting guide
asks you to.
On Mon, 8 Nov 2004, JoÃ£o Mendes Moreira wrote:
> I have the following problem:
> test is a data frame with 9 fields. The field test$Date is factorized with dates. The format is dd-mm-yyyy (using Oracle notation). I want to convert this to Date in '%Y-%m-%d format.
> What I am doing is:
> for (i in 1:nrow(test))
> test is a data frame.
> The error is:
> Error in "$<-.data.frame"(`*tmp*`, "Data", value = list(sec = 0, min = 0, :
> replacement has 9 rows, data has 1
> But if I do:
> it works! Why the assignement does not work?
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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