[R] Time Plot Question.

[John Jaynes]

Hello,

I have some data (sar -A -f sar_data.file > mydata) that span 24 hours, more or less, 00:00:00 - 23:59:59, or so. 
I would like to retain and plot data for all 24 x 60 x 60 = 86,400 seconds. I am able to set the x coordinates equal 
to  ISOdate( year, month, day, hour, minute, second) calls. However, ISOdate calls such as 

"ISOdate(2003, 7, 13, 7, 0:59, 0:59)"

 do not return all the seconds contained in hour 7. These function calls works:

R> x <- ISOdate(2003, 7, 13, 7)
R> for(j in 0:59) for(i in 0:59) x <- c(x, ISOdate(2003, 7, 13, 7, j, i )),

assigning all the seconds contained in hour 7, to x.

When I attempt this

for(k in 7:23) for(j in 0:59) for(i in 0:59) x <- c(x, ISOdate(2003, 7, 13, k, j, i )),

my computer hangs, as, I am guessing, this call requires too much memory of some sort. I could break up these
data and plot 1 Hour blocks, but would like to also view this data in a 24 Hour plot. The raw data appears as:

Time	              user      nice    system      idle
08:42:07             79.00      0.00     21.00      0.00
08:42:08             87.00      0.00     13.00      0.00
08:42:11             92.24      0.00      7.76      0.00
08:42:13             41.09      0.00      3.27     55.64
08:42:15             95.67      0.00      4.33      0.00
08:42:16             98.00      0.00      2.00      0.00

...

Is there an easier way to do this? I have read the help pages, but have not found one that is applicable. Any help
would be greatly appreciated. Thanks for making this Very useful program freely available.

John