I understand the idea but I did not succeed.
Here is what I tried:
## 1. middles of classes calculation
m <- tapply(DF$x, groups, mean)
## 2. create a new factor columns with the levels deduced from
## the values of the middles of the classes
##
DF$m <- DF$groups
levels(DF$m) <- as.character(m)
DF$m <- as.numeric(levels(DF$m))[DF$m]
## 3. I verify with xyplot
xyplot( y ~ m
, type = "p"
, data=DF
, scales = list(
y = list(log=T)
, x = list(log=T)
)
)
## 4. I use the panel.groups and panel.bwplot to display the boxplots
without success
xyplot( y ~ m
, groups = groups
, type = "p"
, data=DF
, scales = list(
y = list(log=T)
, x = list(log=T)
, panel = panel.superpose
, panel.groups=function(x,y, group.number,...){
panel.xyplot(x,y,...)
panel.bwplot(x,y,...)
}
, horizontal = FALSE
, box.width = .0001
)
)
thx
Le 10/12/2022 à 17:02, Deepayan Sarkar a écrit :
Log-scales for the "factor" variable in bwplot() is not allowed.
You could, however, use the panel function panel.bwplot() with
xyplot(num ~ num). The potential problem with that is the box widths,
which panel.bwplot() will not know how to compute.
See if the following gives you a reasonable starting point:
DF <- within(DF, m <- tapply(y, groups, mean))
xyplot(y ~ m, DF, scales = list(log = TRUE),
panel = panel.bwplot, horizontal = FALSE,
box.width = .0001)
Best,
-Deepayan
On Sat, Dec 10, 2022 at 7:46 PM Laurent Rhelp <[email protected]> wrote:
Dear R-Help list,
I would like to use bwplot from the lattice package with a log scale
both on
the x-axis and the y-axis but I do not know how to do that because I do
not know
how to change the factor x-axis in a numeric x-axis.
Here is my example:
library(lattice)
# the mock data
y <- runif(100000,min=0, max=500)
x <- seq(0,500,length=length(y))
# I cut the x variable to create a factor variable in order to calculate
the boxes
groups <- cut(x,10,ordered_result = TRUE)
# creating the dataframe for the lattice functions
DF <- data.frame( x= x , y = y, groups = groups)
## ok for xyplot
xyplot( y ~ x
, data=DF
, scales = list(
y = list(log=T)
, x = list(log=T)
)
)
## ok for bwplot with the log scale for the y-axis
bwplot( y ~ groups
, data=DF
, scales = list(
y = list(log=T)
# , x = list(log=T)
)
)
## Non ok for bwplot with the log scale for the x-axis
bwplot( y ~ groups
, data=DF
, scales = list(
y = list(log=T)
, x = list(log=T)
)
)
which gives an error because the x-axis is a factor, I would like to
replace it
for the display by the meddle of every class for example and put a log
scale on the x-axis.
Thank you for your help
Best regards
Laurent
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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