R help - Mar 2009 - Convert date to integer

Hello, I have a dataframe containing dates, times and other parameters. The
times have the format "h:m", e.g. 13:00 or 5:30, R classes them as
factors.
I want to change the times to integers e.g. 13:00 -> 1300. I tried to use
"chron" to create a chronological object, but it didn't work for
the times
(yust for the dates). 

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Tamara Hoebinger
University of Vienna
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thoeb <t.hoebinger <at> gmail.com> writes:
> Hello, I have a dataframe containing dates, times and other parameters. The
> times have the format "h:m", e.g. 13:00 or 5:30, R classes them
as factors.
Probably you have read in the data from a file with read.table; check
stringsAsFactors in the docs to avoid the conversion from the beginning.

> I want to change the times to integers e.g. 13:00 -> 1300. I tried to
use
> "chron" to create a chronological object, but it didn't work
for the times
> (yust for the dates). 
> 
If that's all (no NA?) a simple replace might work

df = data.frame(tstr=c("13:00","5:30"))
df$tint = as.integer(gsub(":","",as.character(df$tstr)))


Dieter