[R] problem with dates

[Gabor Grothendieck]

Try converting it from factor to character first:

as.numeric(as.date(paste(date1)))

By the way, if you don't need the date package for a particular reason
you could use the built in Date class which does have an as.Date.factor
method.

On 9/22/05, sloan jones <sledepi at operamail.com> wrote:
> I Have been trying to convert a vector of dates into julian dates using the following commands: as.date & as.numeric.  I can convert a date no problem by doing the following:
>
> as.numeric (as.date ("9/21/2004"))
>
> but as soon as I try to do an entire vector I am given the following:
>
>  as.numeric (as.date(date1))
> Error in as.date(date1) : Cannot coerce to date format
>
> I have tried starting with a number of different date formats including dd/mm/yy, dd/mm/yyyy, month, day, year..
>
> Following is a sample of the vector of dates that I am using:
>
> > date1
>  [1] 7/1/2005   4/27/2005  7/15/2004  11/30/2004 1/8/2005   2/7/2005
>  [7] 7/17/2004  4/1/2004   1/4/2005   12/27/2004 1/5/2005   5/17/2005 ....
>
> it is a factor and its mode is numeric.
>
> What do I need to do?
>
> Sloan
>
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