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diamondplot<-function(x, bg=gray(0.6), col=rainbow,name="", ...) {
if(!is.data.frame(x)) stop("Argument has to be a data frame")
## read original graphical parms
opar<-par(no.readonly = TRUE)
## set background
par(bg=bg)
prop<-0.8
scale<-5
## define aux. functions
## degrees to radiants
deg2rad<-function(alfa) {
(alfa*pi)/180
}
## normalize data w.r.t. maximum
normalizza<-function(x){
x/max(x)
}
## find points' coordinates
coord<-function(x, prop=17) {
n<-length(x)
alfa<-rep(NA,n)
for (i in 1:n) {
alfa[i]<-360/n*i
}
c.x<-sin(deg2rad(alfa))*x*prop
c.y<-cos(deg2rad(alfa))*x*prop
list(x=c.x,y=c.y)
}
## plot n segments originating from the origin(!)
segmenti<-function(n, prop=1, labels=NULL,scale=5) {
plot(0,0,axes=FALSE,xlab="",ylab="",main=name,...)
for(i in 1:n) {
alfa<-360/n*i
x1<-c(0,sin(deg2rad(alfa))*prop)
y1<-c(0,cos(deg2rad(alfa))*prop)
polygon(x1,y1)
text(sin(deg2rad(alfa)),cos(deg2rad(alfa)),labels[i],cex=0.8)
}
for (i in 1:n) {
alfa<-360/n*i
for( j in 1:scale) {
xa<-(sin(deg2rad(alfa))*(1/scale)*j*prop)
ya<-(cos(deg2rad(alfa))*(1/scale)*j*prop)
points(xa,ya,pch=19)
et<-round((1/scale)*j*17)
text(sin(deg2rad(0))+0.1,cos(deg2rad(0))*(1/scale)*j*prop,et,cex=0.8)
}
}
}
n<-dim(x)[[1]]
k<-dim(x)[[2]]
segmenti(n, prop=prop, labels=rownames(x))
for (j in 1:k) {
polygon(coord(normalizza(x[,j]), prop=prop), lty=j, border=col(k)[j])
}
legend(-1.05,1.05,legend=dimnames(x)[[2]],lty=1:k,col=col(k),cex=0.8)
## ripristinate original graph parms
par(opar)
}
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