[R] Replace / with - in date

[David Winsemius]

On Apr 15, 2010, at 7:20 PM, prem_R wrote:

>
>> x <- c("2000/01/01",
> "2001
> / 
> 02 
> / 
> 01 
> ","2000 
> / 
> 03 
> / 
> 01 
> ","2000 
> / 
> 04 
> / 
> 01 
> ","2000 
> / 
> 05 
> /01","2000/06/01","2000/07/01","2000/08/01","2000/09/01","2000/10/01")
>> xd <- as.data.frame(x)
>> levels(xd$x) <- gsub("/", "-", levels(xd$x))
>> fix(xd)
>
> This works fine .but with one more variable say xsd in the data  
> frame i'm
> getting the following error
>
>
> Error in levels(sa$date1) <- gsub("/", "-", levels(sa$date)) :
>  attempt to set an attribute on NULL

Are there two columns date1 and  date in "sa"? Have you made a typo?
>
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David Winsemius, MD
West Hartford, CT