Hi, rasterImage may alleviate the pdf artefacts in the viewer. This seems to produce a similar output,
plot(range(x),range(y), t="n") rasterImage(t(rgb(colorRamp(heat.colors(7))(z/max(z))/255)), min(x),min(y),max(x),max(y), interpolate=FALSE) HTH, baptiste On 16 February 2011 05:43, Steven Cordwell <s.cordw...@uq.edu.au> wrote: > Hi, > > I have a vectors x and z, for example, > > x <- 0:20 > z <- round(runif(20,1,7)) > y <- 0.5 > > and I want to display z as an image. However if I then call image() with a > vector > > image(x,y,t(z),zlim=c(1,7),col=heat.colors(7),xlab="Year",ylab="Action",yaxt="n",xaxs="r",yaxs="r") > > then I get the error > > Error in image.default(x, y, t(z), zlim = c(1, 7), col = heat.colors(7), : > dimensions of z are not length(x)(-1) times length(y)(-1) > > However, transforming z into a matrix with two rows, where both rows are the > same as z above does seem to be a workaround. > > z <- matrix(c(z,z),2,length(z),byrow=TRUE) > y <- c(0.25,0.75) > image(x,y,t(z),zlim=c(1,7),col=heat.colors(7),xlab="Year",ylab="Action",yaxt="n",xaxs="r",yaxs="r") > > The problem is that when I include the figure that is produced in my pdf, > there ends up being a white line that runs through the middle horizontally > (where the divison of the cells is) which ruins the presentation of the > graphic as x > is a time series, and z is an action that is performed at that time. There is > only one action that is performed at each time step in x, and having the line > running through the middle might cause confusion as to how many actions are > performed at any given time. > > I would appreciate any suggestions as to how to get around this, because I > haven't been able to find any options for vectors in image(), or if there is > a different function that does it. > > Cheers > > Steven > > ______________________________________________ > 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.
