Hi: As David originally noted, your dates are going to be read in as factors with data.frame() unless you explicitly define them as Date objects first. Here's one way to get the plot using a toy example (since you didn't provide any data):
library(ggplot2) dd [1] "21/2/10" "30/3/10" "30/4/10" "30/5/10" > class(dd) [1] "character" df <- data.frame(Date = as.Date(dd, format = '%d/%m/%y'), mean = c(10, 12, 13, 11), sd = c(2.5, 3, 4, 3)) > str(df) 'data.frame': 4 obs. of 3 variables: $ Date:Class 'Date' num [1:4] 14661 14698 14729 14759 $ mean: num 10 12 13 11 $ sd : num 2.5 3 4 3 g + geom_point(color = 'red', size = 2.5) + geom_line(color = 'blue', size = 1) + geom_errorbar(aes(ymin = mean - sd, ymax = mean + sd), width = 3) This may not be what you expect, though. If you want the x-axis labels to be the dates as you've written them, one approach is to convert Date to an ordered factor: df$fdate <- factor(dd, levels = dd) h <- ggplot(df, aes(x = fdate, y = mean)) h + geom_point(color = 'red', size = 2.5) + geom_line(aes(group = 1), color = 'blue', size = 1) + geom_errorbar(aes(ymin = mean - sd, ymax = mean + sd), width = 0.3) The aes(group = 1) bit in geom_line() is necessary to plot a line across the levels of a factor. The width parameter in geom_errorbar() behaves differently when x is a factor rather than a date. (Try width = 3 and see :) To change the x scale tick marks while keeping Date as a Date object, use scale_x_date() and add the code to the first plot's code chunk; I'll let you decide how you want to display them. The on-line help page is at http://had.co.nz/ggplot2/scale_date.html HTH, Dennis On Wed, Oct 27, 2010 at 2:17 AM, ashz <a...@walla.co.il> wrote: > > Hi, > > I have this script: > > dat <- data.frame(X = halistat$Date,Y1 = halistat$avg,Y2 = halistat$stdev) > ggplot(data = dat, aes(x = X, y = Y1, ymin = Y1 - Y2, ymax = Y1 + Y2)) + > geom_point() + # points at the means > geom_line() + # if you want lines between pints > geom_errorbar() # error bars, Y1 - Y2 and Y1 + Y2 > > > halistat$Date values: > 29/1/10 > 21/2/10 > 30/3/10 > 30/4/10 > 30/5/10 > > > In the resulted plot the X values are sorted, how can I cancel it? > > Thanks. > > -- > View this message in context: > http://r.789695.n4.nabble.com/ggplot-unwanted-sorted-X-values-tp3015099p3015099.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.