[R] interpreting date-related error message

[Toby Gass]

Thanks to everyone for the explanations.

Toby

On 27 Aug 2010 at 12:46, Phil Spector wrote:

> Toby -
>      Since dat$doy is just a number, the default S3 method
> for format is used, where the second argument is the trim
> parameter.  I suspect you are confusing format (which is for
> output) with strptime (which is for input).
>       For example,
> 
> strptime(dat$doy,'%j')
> 
> will assume that the dates are in the current year, and 
> return a POSIXlt object.  Alternatively, you could pass
> an origin to as.Date:
> 
> as.Date(dat$doy,origin='2009-12-31')
> 
> to get a similar Date object.
> 
>                                           - Phil
> 
> 
> On Fri, 27 Aug 2010, Toby Gass wrote:
> 
> > Hello, helpeRs,
> >
> > I have a vector of numbers from 1-365 (days of the year) that I would
> > like to convert to a date.  There are no NA's and no missing values.
> > I did not insert leading zero's for numbers less than 100.
> >
> > Using the syntax:
> >
> > dat$doy.1 <- as.numeric(format(dat$doy, "%j" ))
> >
> > I get the following error message:
> >
> > Error in prettyNum(.Internal(format(x, trim, digits, nsmall, width,
> > 3L,  :
> >  invalid 'trim' argument
> >
> > .What is the error message telling me?
> > (Windows OS and R 2.11.1)
> >
> >
> > Thank you.
> >
> > Toby
> >
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>