Brian,
Thanks for your reply. The data I have was downloaded from a
government database so it now seems that the problem is how to
convert all the records in the format '1-Apr-08' to the format 2008-04-11.
I can ask the person working on the new version of this database
whether they will use this standard, it certainly isn't in common use.
Your explanation did make the help files, which I typically struggle
with, clearer.
Bob
At 07:03 PM 11/04/2008, you wrote:
>You need to give the format -- 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 , 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, [EMAIL PROTECTED]
>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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