Sam, I recommend taking a look at the ggplot2 package. This page from the author's website contains an example of what I think you are trying to achieve:
http://had.co.nz/ggplot2/geom_segment.html Obviously, this would require doing the whole plot in ggplot2, but that's not at all unpleasant. There's even a mailing list (on Google Groups) from ggplot2 with lots of friendly people to help. Best of luck, Jonathan On Thu, Jul 22, 2010 at 8:56 AM, Sam Albers <tonightstheni...@gmail.com>wrote: > Hello, > > I am trying to create a plot often seen in hydrodynamic work than includes > a > contour plot representing the water speed with arrows pointing in the > direction of flow. Does anyone have any idea how I might add arrows based > on > wf$angle (in the example below) to the plot below? > > Thanks in advance! > > Sam > > library(lattice) > > speed <- runif(100, 0, 20) > wf <- data.frame(speed) > wf$width <- (1:10) > wf$length <- rep(1:10, each=10) > wf$angle <-runif(100, 0, 360) > > #How do I add arrows based on wf$angle within each coloured box to > represent > the direction of flow? > #i don't have to use lattice. Just using it as an example. > with(wf, contourplot(speed ~ width*length, > region=TRUE, > contour=FALSE > )) > > -- > ***************************************************** > Sam Albers > Geography Program > University of Northern British Columbia > 3333 University Way > Prince George, British Columbia > Canada, V2N 4Z9 > phone: 250 960-6777 > ***************************************************** > > [[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. > [[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.
