On Mon, 17 May 2004 09:39:01 +0100, Barry Rowlingson
<[EMAIL PROTECTED]> wrote:
>[EMAIL PROTECTED] wrote:
>> Dear wonderful R community,
>>
>> I've been creating color-coded concentric circles using the "points" function,
>> but I just realized that what I would really like to do is draw color-coded
>> concentric half-circles.
>
>> What should I do?
>
>Write a 'halfCircle' function.
>
>halfCircle <- function(x,y,r,start=0,end=pi,nsteps=30,...){
> rs <- seq(start,end,len=nsteps)
> xc <- x+r*cos(rs)
> yc <- y+r*sin(rs)
> lines(xc,yc,...)
>}
Alexis, besides lines(), you should look at the polygon() function
(which can fill the regions).
Duncan Murdoch
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