1. Another way to address this is to include g in the type vector:
xyplot(Sepal.Length + Sepal.Width ~ Petal.Length ,
data = iris, allow.multiple = TRUE, scales = same, type = c(l, g))
2. Also look in the example section of:
library(zoo)
?xyplot.zoo
which gives an example of plotting a grid behind an existing plot. You
could define a function to do that and then just call it after your xyplot call.
3. You could define your own panel function:
mypanel - function(...) { panel.grid(); panel.superpose(...) }
so that you only have to write panel = mypanel in the arg list.
4. You could define your own xyplot2 which calls xyplot and uses one
of the above methods to ensure that it does it with a grid.
On 11/15/06, Pascal Boisson [EMAIL PROTECTED] wrote:
Hello all,
I want to draw a grid behind my graphes, using lattice package.
I manage to do it with instructions like this one :
xyplot(Sepal.Length + Sepal.Width ~ Petal.Length ,
data = iris, allow.multiple = TRUE, scales = same,type=l,
panel = function(...) { panel.grid(h=-1, v= -1) ;
panel.superpose(...)
}
)
I was wondering if there were a way to do it using for example
trellis.par.set() to set this by default, like what I do for colors e.g. :
trellis.par.set(list(superpose.line = list(col = c( red, yellow,
green, blue, purple, orange, black, maroon, pink, cyan,
grey, magenta
instead of using in each call this log panel = function (...) { }
instruction
I tried emprirically
trellis.par.set(list(grid.pars= list(h = -1, v=-1)))
with no success (I am not even sure that this grid.pars is about drawing
grids ... but it is the nearest instruction i found in trellis parameters
As i am not very confident with this trellis.par.set(), I might have missed
something ... I also tried to define a function
grid-function(...) { panel.grid(h=-1, v= -1) ; panel.superpose(...) }
xyplot(Sepal.Length + Sepal.Width ~ Petal.Length ,
data = iris, allow.multiple = TRUE, scales = same,type=l,
panel = grid() #also tried grid(...)
)
but the only result is an arror message
with grid() : Erreur dans unit(y0, default.units) : 'x' et 'units' doivent
avoir une longueur positive (x and units should have a positive length)
with grid(...) : '...' utilisé dans un contexte incorrect ('...' used in
a wrong context)
Could anyone tell me a way of doing it ?
--
Pascal Boisson
[EMAIL PROTECTED]
http://pak.enroweb.com
http://www.flickr.com/photos/hoothootprod/
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