On Mon, Sep 27, 2010 at 5:38 PM, Struve, Juliane
<j.str...@imperial.ac.uk> wrote:
> Hello,
>
> thank you very much for replying. The code yields an error message
>
> Error in strptime(x, format, tz = tz) : invalid 'x' argument
>
> But I can't see what's wrong with it, the Date/Time info is in the third
> column, format is
> "%Y-%m-%d %H:%M:%S". There is no time zone info in the data, could this be a
> problem ?
>
See the last line on every message to r-help. You need to put
together a minimal self contained example that illustrates the
problem.
The best I can do with the information provided is to point out that this works:
> Lines <- '"","Fish_ID","Date","R2sqrt"
+ "1",1646,2006-08-18 08:48:59,0
+ "2",1646,2006-08-18 09:53:20,100'
>
> library(zoo)
> library(chron)
> read.zoo(textConnection(Lines), header = TRUE, FUN = as.chron,
+ sep = ",", colClasses = c("NULL", "NULL", "character", "numeric"))
(08/18/06 08:48:59) (08/18/06 09:53:20)
0 100
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