[R] Lost in POSIX

[David Winsemius]

On Dec 25, 2010, at 2:25 PM, Dimitri Shvorob wrote:

>
> df = structure(list(t = structure(c(1033963406.044, 1033974144.847,
> + 1033988418.836), class = c("POSIXt", "POSIXct"))), .Names = "t",  
> row.names
> = c(NA,
> + 3L), class = "data.frame")
> df$min = trunc(df$t,units="mins")
>
> does not work,

??? seems to "work" on my system. Perhaps you should say what you mean  
by "not work"

 > df
                     t                 min
1 2002-10-07 00:03:26 2002-10-07 00:03:00
2 2002-10-07 03:02:24 2002-10-07 03:02:00
3 2002-10-07 07:00:18 2002-10-07 07:00:00
 > sessionInfo()
R version 2.12.1 (2010-12-16)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] grid      splines   stats     graphics  grDevices utils      
datasets  methods   base

other attached packages:
  [1] nlme_3.1-97        lme4_0.999375-37   Matrix_0.999375-46  
zoo_1.6-4          ggplot2_0.8.8      proto_0.3-8         
reshape_0.8.3      plyr_1.2.1         MASS_7.3-9
[10] rms_3.1-0          Hmisc_3.8-3        survival_2.36-2     
sos_1.3-0          brew_1.0-4         lattice_0.19-13

loaded via a namespace (and not attached):
[1] cluster_1.13.2 stats4_2.12.1  tools_2.12.1


> Jeff; you will see that my original post suggests familiarity
> with 'trunc' :)
>
>
> -- 
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>
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David Winsemius, MD
West Hartford, CT