Re: [R] filled.contour with log axis
On 16/02/2008 7:33 PM, Thomas Hoffmann wrote:
> Dear all,
>
> I would like to generate a filled.contour plot with log x and y axis,
> however using:
>
> filled.contour(as.line,log="xy")
>
> results in a warning message.
>
>
> Does anybody knos what to do?
You could transform your x and y values to their logs, and then use
custom axis() calls to plot the axes. For example, a modification of
the first example from ?filled.contour:
x <- 10*1:nrow(volcano)
xtick <- pretty(x)
x <- log(x)
y <- 10*1:ncol(volcano)
ytick <- pretty(y)
y <- log(y)
filled.contour(x, y, volcano, color = terrain.colors,
plot.title = title(main = "The Topography of Maunga Whau",
xlab = "Meters North", ylab = "Meters West"),
plot.axes = { axis(1, at=log(xtick), label=xtick);
axis(2, at=log(ytick), label=ytick) },
key.title = title(main="Height\n(meters)"),
key.axes = axis(4, seq(90, 190, by = 10)))# maybe also asp=1
Duncan Murdoch
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Re: [R] filled.contour with log axis
Thomas Hoffmann <[EMAIL PROTECTED]> wrote in news:[EMAIL PROTECTED]: > Dear all, > > I would like to generate a filled.contour plot with log x and y > axis, however using: > > filled.contour(as.line,log="xy") > > results in a warning message. > > > Does anybody knos what to do? Use a function that does accept the a parameter that does what you expect from log? Perhaps contourplot from the lattice package which has an extremely versatile scales parameter. Or the stat_contour() geometry in ggplot2? I did not find a scale or a log argument but there was an example at Hadley's webpage that used a scale modification to the z value. This experiment based on that that example seemed to create the expected behavior: library(ggplot2) volcano3d <- rename(melt(volcano), c(X1="x", X2="y", value="z")) v <- ggplot(volcano3d, aes(x=x,y=y,z=z)) v + stat_contour() +scale_x_log10() +scale_y_log10() -- David Winsemius __ 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] filled.contour with log axis
Dear all, I would like to generate a filled.contour plot with log x and y axis, however using: filled.contour(as.line,log="xy") results in a warning message. Does anybody knos what to do? Thanks Thomas __ 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.
