Hi
Are you sure that In Excel your times have same formating? There can be many
sources of quirks from Excel itself through automatic csv conversion performed
by Pearl to reading this csv to R. I presume that the timestamp is not actually
in POSIX format (check with str) so if it is consistent in each data.frame you
can do the conversion by
?strptime
Regards
Petr
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Marte Hansen
> Sent: Thursday, July 03, 2014 10:33 AM
> To: r-help at r-project.org
> Subject: [R] Comparing two times with different format
>
>
> I want to compare two tables, but the format on the time stamps are
> different. Both had the same format in Excel, but when I read those
> into R,
> the times have changed in the following way:
> 00:00 = 0:00, that is, the smallest dataset has the original time
> stamp, the
> largest has a new format. The two dataset are pretty big, about 65 000
> rows
> on the smallest and 350 000 rows in the largest... So changing them
> manually
> is not an option.
>
> They are read in the same, so I don't understand how one of them
> changes the
> format on one column.
>
> Hist <- read.xls(HistFil, perl = perl, header = FALSE, colClasses = c(
> rep("character", 7)))
> Ra <- read.xls(RaFil, perl = perl, header = TRUE, colClasses >
c(rep("character", 6)))
>
>
>
> [[alternative HTML version deleted]]
>
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