[R] GGPLOT2: Distance of discrete values of from each end of x-axis

[Thomas Schmitt]

Hi Group,

I have been working with the code below. Everything seems to work
okay, except that the discrete values on the x-axis are far from each
end of the graph. I've tried several things including changing the
discrete values and playing with the limits, but can't get it to work.
I tested this on simulated data and do not have the same problem, so I
guessing it is how I'm processing the data. I'd appreciate any
pointers on how to adjust this and/or process the data correctly so it
does not occur. The data file being imported is a combination of
continuous, discrete and string variables.

Thanks,

Tom

vicryl.wide <- read.table("C:/vicryl2.csv",
                          header=TRUE, sep=",", na.strings=" ")

library(reshape2)
vicryl.long <- melt(vicryl.wide,
                    id.vars=c("id_finger","sex"),
                    measure.vars=c("pre_angle_r", "post_angle_r"),
                    variable.name="pre_post")

names(vicryl.long)[names(vicryl.long)=="value"] <- "angle"

levels(vicryl.long$pre_post)[levels(vicryl.long$pre_post)=="pre_angle_r"] <- 0
levels(vicryl.long$pre_post)[levels(vicryl.long$pre_post)=="post_angle_r"] <- 2

vicryl.long <- vicryl.long[ order(vicryl.long$id_finger,
vicryl.long$pre_post), ]

library(ggplot2)
ggplot(data=vicryl.long, aes(x=pre_post, y=angle, group=id_finger)) +
geom_line()