On Wed, Jul 18, 2012 at 6:42 AM, Jim Lemon <j...@bitwrit.com.au> wrote: > On 07/18/2012 08:02 PM, Stuart Leask wrote: >> >> Hi there. >> >> I have been plotting some circles using 'symbols', with radii representing >> my data, but the radii looked incorrect. >> >> It seems to happen with a single circle too: >> >> Symbols ( 0, 0, circles = 40, xlim = c(-40, 40), ylim= c(-40, 40)) >> >> If I put a ruler up to my monitor (technology!) to compare the radius >> with the axes, the circle isn't radius 40; it is closer to 15... >> >> I suspect there is a simple answer. >> > Hi Stuart, > The answer does not appear to be simple. While the documentation for symbols > says that the "inches" argument controls the size of the circles, it appears > to do so with reference to the user units of the plot, not to that quaint > unit descending from the twelfth part of someone's foot. So, whatever > numbers you pass as "circles" seem to be scaled to a maximum dimension of > whatever "inches" is in user units, at least on the x11 graphics device.
>From ?symbols: If inches is FALSE, the units are taken to be those of the appropriate axes. Is that not what's wanted here? Sarah -- Sarah Goslee http://www.functionaldiversity.org ______________________________________________ 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.
