drawing a circle using symbols
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/