[R] drawing a circle using symbols

[Troels Ring]

Thanks a lot, Paul!
Best wishes
Troels

At 20:05 29-11-2005, you wrote:
>Hi
>
>
>Troels Ring wrote:
>>Dear friends, I was drawing a circle with centrum in (1,-1) and 
>>radius 5 to show my girl that the line y=3*x+1 goes through (1,4) 
>>and (-2,-5) of the circle, but on Windows XP, R 2.20 the drawing 
>>was not good at all, and the known solutions were not shown in the 
>>graph. I guess I got it wrong? Is this use not intended ?
>>Best wishes
>>Troels Ring, MD
>>Aalborg, Denmark
>>symbols(x=1,y=-1,circles=5,inches=FALSE, xlim=c(-10,10),ylim=c(-10,10))
>>curve(3*x+1,-10,10,1000,add=T)
>>abline(v=c(-2,1))
>>abline(h=c(-1,-5,4))
>
>
>The important part may be that your plot is not square.   In the 
>help file for symbols() it says (NOTE the "x axis") ...
>
>   inches: If 'inches' is 'FALSE', the units are taken to be those of
>           the x axis.
>
>If you precede your code with ...
>
>   par(pty="s")
>
>... does the result look better?
>
>Paul
>--
>Dr Paul Murrell
>Department of Statistics
>The University of Auckland
>Private Bag 92019
>Auckland
>New Zealand
>64 9 3737599 x85392
>paul at stat.auckland.ac.nz
>http://www.stat.auckland.ac.nz/~paul/