[ale] Anyone familiar with R?

[George Allen]

I'm trying to learn R, as well as analyze some data out of Cisco
Unified Contact Center (call center setup) for a helpdesk. UCCX has an
app that will generate reports via crystal reports into excel, but
it's cumbersome and doesn't exactly generate what I want.

So...

Have a data set like:

> head(z)
    r$SESSION.ID      START_DATETIME QUEUE.TIME TALK.TIME HOLD.TIME WORK.TIME
1 1-5000003350-0 2011-03-01 07:00:03        297       134         0         4
2 1-5000003351-0 2011-03-01 07:02:23        234       404         0        30
3 1-5000003353-0 2011-03-01 07:05:33        120       214         0        30
4 1-5000003356-0 2011-03-01 07:09:32        137       229         0        30
5 1-5000003358-0 2011-03-01 07:12:49         69       577         0        30
6 1-5000003360-0 2011-03-01 07:21:38         29       288         0        30

and I want to do something like:

subset(z, z$START_DATETIME >= as.POSIXlt('2010-03-01') |
z$START_DATETIME <= as.POSIXlt('2010-03-07'), "START_DATETIME")

to pull one week's worth of data, but instead it dumps the whole dataframe.
Ultimately, I want to do this:

hist(z[z$START_DATETIME >= as.POSIXct('2010-03-01') | z$START_DATETIME
<= as.POSIXct('2010-03-07'), "START_DATETIME"], 'hours', freq=TRUE)

and have it dump only that first week, currently it does the whole set...