Re: [R] Error in fromchar(as.character(x)) : character string is not in a standard unambiguous format

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Fri, 11 Apr 2008 10:03:31 +0100 (BST)

You need to give the format -- '1-Apr-08' might mean 2008-04-01 or 2001-04-08, and R refuses to guess.

Please *do* read the help file (e.g. as.Date) before posting: the international standard format is 2008-04-11, and Australia has adopted that standard.

On Fri, 11 Apr 2008, Bob Green wrote:

> Hello,
>
> I was hoping for advice regarding resolving the above error.

Telling R what you intend is the usual way to resolve user errors caused by ambiguous input.

>
> I have a csv file that contains the following variable:
>
> $ Order.Made.Date : Factor w/ 299 levels
> "1-Apr-08","1-Aug-05",..: 278 285 91 286 159 132 108 261 282 147 ...
>
>
> I want to calculate a variable named F.length, which is today's date
> minus the values contained in the variable: April$Order.Made.Date)
> I tried altering the date format but continued to receive the same error.
>
> > F.length <- difftime ("11/04/2008", April$Order.Made.Date)
> > Error in fromchar(as.character(x)) : character string is not in
> a standard unambiguous format
>
> > Order.date <- as.Date (April$Order.Made.Date)
> > Error in fromchar(x) : character string is not in a standard
> unambiguous format
> > Order.date <- 'as.POSIXlt' (April$Order.Made.Date)
> Error in fromchar(as.character(x)) : character string is not in a
> standard unambiguous format
>
> Any suggestions are appreciated,
>
> Bob

-- 
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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