[R] Rose diagrams in R?
Joerg Maeder
joerg.maeder at ethz.ch
Fri Nov 23 13:46:52 CET 2001
Hello David,
i wrote a small function (rose) for that problem. It accept datas
between 0 and 360 and draw something
like you want. You also can
rose <- function(data,step=30,main='wind rose'){
deg2rad <- 180/pi
data <- (data+step/2)%%360# Values like 359 go to Sector 0
histdata <- hist(data,breaks=seq(0,360,by=step),plot=F) #use hist for
counting
counts <- histdata$counts
maxcount <- max(counts)
mids <- (histdata$mids-step/2)/deg2rad
step <- step/deg2rad
plot(c(-1,1),c(-1,1),,xlab='',ylab='',
main=main,xaxt='n',yaxt='n',pch=' ')
for (i in 1:length(counts)){
w1 <- mids[i]-step/2
w2 <- mids[i]+step/2
lines(counts[i]/maxcount*c(0,sin(w1),sin(w2),0),
counts[i]/maxcount*c(0,cos(w1),cos(w2),0))#draw sector
text(sin(mids[i]),cos(mids[i]),counts[i])
}
names(counts) <- round(mids*deg2rad,3)
counts
}
#Test with 500 values between 0 and 360 (uniform distribution)
rose(runif(500)*360,360/16)
David Finlayson wrote:
>
> I am looking for a function (or package) to plot histograms of directional
> data such as wind direction. I believe these are called rose diagrams. Is
> there an R script for this? If not, can it be constructed in a function
> calling primitive graphic calls (lines, circles, boxes or polygons)?
>
> The stars function is not quite right.
>
> --
> David Finlayson
> Geomorphogist and GIS Specialist
> NearPRISM - Nearshore Research Group
> University of Washington, Seattle, WA
> (206) 543-7229
>
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--
Joerg Maeder IACETH INSTITUTE
PhD Student FOR ATMOSPHERIC
Phone: +41 1 633 36 25 AND CLIMATE SCIENCE
Fax: +41 1 633 10 58 ETH ZÜRICH Switzerland
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