[R] Coercing a dataframe column to datetime

[Prof Brian Ripley]

You have forgotten as.POSIXct is needed too.

On Mon, 14 Jun 2004 richard.kittler at amd.com wrote:

> I am trying to coerce a data frame column from character to datetime using strptime but keep getting an error because the length of the coerced object is always 9.  What am I doing wrong here:   
> 
> .................................................................
> > ds <- cbind(1:2, c("02/27/92 23:03:20", "02/27/92 22:29:56")); ds 
>      [,1] [,2]               
> [1,] "1"  "02/27/92 23:03:20"
> [2,] "2"  "02/27/92 22:29:56"
> >  
> > q <- strptime(ds[,2], "%m/%d/%y %H:%M:%S"); q
> [1] "1992-02-27 23:03:20" "1992-02-27 22:29:56"
> > 
> > ds[,2] <- q
> Error in "[<-"(`*tmp*`, , 2, value = q) : number of items to replace is not a multiple of replacement length
> > 
> > length(q)
> [1] 9
> 
> .................................................................
> 
> --Rich
> 
> Richard Kittler 
> AMD TDG
> 408-749-4099
> 
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-- 
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)
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