[R] plotting magnitude

[Jim Lemon]

dkowalske at umassd.edu wrote:
> I am plotting fishing vessel positions and want these points to be
> relative in size to the catch at that point.  Is this possible? I am just
> begining to use R and my search of the help section didnt help in this
> area.  Heres what Im using so far
> 
> xyplot(data$latdeg~data$londeg |vessek , groups=vessek,
> xlim=rev(range(69:77)),ylim=(range(35:42)), data=data,
> 	main=list ("Mackerel catches", cex=1.0),
> 		ylab="latitude", notch=T, varwidth=T,
> 		xlab="longitude", cex.axis=0.5,)
> any info would be appreciated
> 
Hi,

What you might want is something like this:

library(maps)
data(world2MapEnv)
map("world2",xlim=c(110,160),ylim=c(-45,-10))
axis(1)
axis(2)
library(plotrix)
draw.circle(155,-30,1,col="red")
draw.circle(155,-32,1.2,col="blue")
draw.circle(153,-34,1.5,col="green")

where 1, 1.2, 1.5 are the relative sizes of catch.
Oh, and you would probably want the North Atlantic part of the map...

Jim