Message-ID: <4AECCD51.5010703@bitwrit.com.au>
Date: 2009-10-31T23:50:41Z
From: Jim Lemon
Subject: polar.plot
In-Reply-To: <e03903010910301049v2046d667rbf317326a6500429@mail.gmail.com>
On 10/31/2009 04:49 AM, Tony Greig wrote:
> Hi,
>
> Two questions:
>
> 1 - Say I have average speed and directions for tide and I would like to
> plot them on a polar plot, but with different colors so I can indicate the
> two directions. I'm using polar.plot from the plotrix library. How can I add
> a second "b" and "dir.b" series to a polar.plot?
>
> library(plotrix)
> a = 3
> dir.a = 85
> b = 4
> dir.b = 250
> polar.plot(a, dir.a, start = 90, clockwise = T, show.grid.labels = T,
> radial.lim=c(0,5), line.col=2, lwd=2)
>
>
> 2 - Which parameter in polar.plot can I use to set the orientation for the
> grid labels which seem to default at 90 in my example above?
>
>
Hi Tony,
The first one is easy:
polar.plot(c(a,b), c(dir.a,dir.b), start = 90,
clockwise = T, show.grid.labels=FALSE,
radial.lim=c(0,5), line.col=2, lwd=2)
I have had one other person as about an "add" option, and I might
include that in a future version. The second one is a bit harder. You
probably noticed that I changed the show.grid.labels argument to FALSE
in the above.
par(xpd=TRUE)
boxed.labels(rep(0,5),1:5,1:5,border=NA)
par(xpd=FALSE)
This will put the labels vertically up from the center. Doing fancier
things like having the labels at an angle would require calculating the
positions, which isn't too hard.
Jim