Hello list,
Thank you very much for replying to my earlier questions. I have a few new
questions about R plots:
Example: tempdata:
RDate Price
2009-12-09 12:00 100
2009-12-09 15:00 99
2009-12-09 18:00 102
....
2009-12-10 8:00 120
2009-12-10 10:00 110
2009-12-10 16:00 105
My code: (RDate already in R date-time class)
plot (price~RDate, data=tempdata, "l")
axis.POSIXct(1, at=seq(min(data$RDate), max(data$RDate)+60, by="3 hours"),
format="%H:%M")
grid(lwd=1)
1. The default grid lines do not seem to correspond with the ticks in my
axis. Grid has options for absolute numbers of grid lines, but I would not
want to paste an absolute number here, as I don't know the number of ticks
generated by seq.
2. The tick label on the x axis should be in 2 lines. My x axis is the time
and date (2009/12/09 12:00), I want to show the time on the first line and
some of the dates on the second, visually as below:
-------|----------------|------------------|------------------------
12:00 15:00 18:00
12/09 12/09
How should I specify this?
3. I don't want line to automatically connect the between the missing
periods, i.e., suppose my data was hourly from 12/09 to 12/10, but there is
no data between 2009-12-09 18:00 and 2009-12-10 8:00, the two data points at
these dates should not be connected.
4. I would like to label the uppermost values of the axes, which R does not
seem to label.
5. Is there a graphic package where perhaps all these details have been
figured out?
Thank you very much for your help!
Tam
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