Hi: On Tue, Aug 16, 2011 at 5:48 AM, Johannes Radinger <jradin...@gmx.at> wrote: > Hello, > > I am a beginner with ggplot and after doing simple graphs (histogram, > segments etc.) > some questions came up: > > 1) I tried to do a histogram, but nothing is displayed although it works with > another vector. > I think it is because of the very small values (n=1000, min=1.222e-24 max, > 1.890e-20). > I used qplot(variable,geom="histogram")... If do it with the standard plot > function it works perfectly.
Similar problems have been reported before, but I thought it had been fixed in recent versions. [I could be wrong, though...) Which versions of R and ggplot2 are you using? (Report sessionInfo(), please.) > > 2) I want to use scale_colour_gradient(). Is there any reference where I can > find the predefined colour-palletes like rainbow etc. and how they look like? There is some discussion of this in Hadley's ggplot2 book (pp. 104-106). See also http://had.co.nz/ggplot2/scale_gradientn.html http://had.co.nz/ggplot2/scale_brewer.html > > 3) How can I change the white grid in the background? In some cases I'd like > to > remove the white grid A group of enterprising ggplot2 users recently put together a page of user-defined themes for the community: https://github.com/hadley/ggplot2/wiki/themes/ Another one, called 'theme_nothing' and authored by David Kahle of Rice U., blanks out most of the options in a ggplot: # david kahle # sept 27, 2010 theme_nothing <- function (base_size = 12){ structure(list( axis.line = theme_blank(), axis.text.x = theme_blank(), axis.text.y = theme_blank(), axis.ticks = theme_blank(), axis.title.x = theme_blank(), axis.title.y = theme_blank(), axis.ticks.length = unit(0, "lines"), axis.ticks.margin = unit(0, "lines"), legend.position = "none", panel.background = theme_blank(), panel.border = theme_blank(), panel.grid.major = theme_blank(), panel.grid.minor = theme_blank(), panel.margin = unit(0, "lines"), plot.background = theme_blank(), plot.title = theme_text(size = base_size * 1.2), plot.margin = unit(c(-1, -1, -1.5, -1.5), "lines")), class = "options") } You could study these themes to get an idea how to create one of your own that retains the features you desire. > > 4) How are the ticks on the X-axis calculated? Can they be changed in a way > that > always 5 ticks with the corresponding numbers (labels) are displayed on the > X-axis. Yes; see http://had.co.nz/ggplot2/scale_continuous.html and note the examples. There is also a list for ggplot2 apart from R-help; you can subscribe to it from http://had.co.nz/ggplot2/ Look for the heading 'Mailing list'; the on-line help pages are further down the page. Follow-ups should probably be sent to this list rather than R-help. HTH, Dennis > > Thank you very much > > Johannes > -- > > ______________________________________________ > 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. > ______________________________________________ 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.
