On Thu, Jan 29, 2009 at 7:53 PM, Daniel Kornhauser
d...@northwestern.edu wrote:
Hi:
I am coding some interactive interface using an xyplot from lattice.
When a user clicks on a panel of the xyplot, a simulation is executed and
the resulting data is plotted on the corresponding panel.
The problem is that I start with an empty data frame and only fill it as the
user request data from simulations.
And, I have found it impossible to create a conditional plot that contains
panels using an empty data frame.
For example I want:
library(lattice)
e = data.frame(a, b, c, d)
xyplot(X.a. ~ X.b. | X.c. + X.d., data = e, xlim = c(c(50,60),c(60,70)),
ylim = c(c(10,20),c(20,30)), drop.unused.levels=FALSE,layout = c(2,2))
to create a empty xyplot that would look like:
50 60 70
10 | | |
| | |
| | |
20
| | |
| | |
30 | | |
-
but it doesn't create 4 panels it only creates a single panel:
5060 70
---
10 | |
20 | |
30 | |
I am a novice in R so I hope this is not a question that is too easy for the
r-devel list.
I think you've directed your email to the wrong list. R-devel, is
primarily targeted at people who write add-on packages (such as
lattice itself) or the R core.
Please see: http://www.r-project.org/posting-guide.html#which_list
This question should be directed to r-help which you can subscribe to here:
http://www.r-project.org/mail.html
Thanks.
Daniel.
PS: I got around this problem by creating dummy data frames containing
data with the sole purpose of indicating xyplot the data rages.
It works well, but I consider it a hack.
If it that works, why do you consider it a hack? There's probably a
more elegant way, but I would probably just make data frames, filled
with NA.
HTH
Peter
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