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[求助] R语言做聚类分析画树状图

刚刚学的R语言
x<-c(3.570610592,4.107022441,4.249821565,5.421042335,5.443434884,5.698908667,5.808387613,5.814230818,6.466983841,6.639928463,7.849212275,8.345372969,8.44271086,8.57715454,8.868679721,8.989827585)
dim(x)<-c(16,1)
d<-dist(x)
hc1<-hclust(d,"single"
opar<-par(mfrow=c(2,2))
plot(hc1, hang=-1);
par(opar)

做了聚类的图,但是我想把每一类的名称写上去,还有做成的图是水平的,(不要系统默认的垂直)?哪位大神支一下招?
row.names(x)<-c("326","352","373","343","327","323","341","347","344","325","340","331","348","324","329","368"这样定义老出错?
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