Hi, You forgot a closing parentheses ")". ?x<-matrix(cells,nrow=7,ncol=2,byrow=TRUE,dimnames=list(rnames,cnames) ##### ?#run K-Means ?km <-kmeans(x,4,10) #Error: unexpected symbol in: #"#run K-Means #km" x<-matrix(cells,nrow=7,ncol=2,byrow=TRUE,dimnames=list(rnames,cnames) ) ?km<-kmeans(x,4,10) km$cluster #A B C D E F G #3 2 4 1 2 3 4 A.K. Hi, ? ? ?I am a new comer to R & I am trying to execute the below K-Means code: cells <-c(1.1,60,8.2,20,4.2,35,1.5,21,7.6,15,2.0,55,3.9,39) rnames <-c("A","B","C","D","E","F","G") cnames <-c("X","Y") x<-matrix(cells,nrow=7,ncol=2,byrow=TRUE,dimnames=list(rnames,cnames) #run K-Means km?<-kmeans(x,4,10) #print components of km print(km) #plot clusters plot(x,col=km$cluster) #plot centers points(km$centers,col=1:2,pch=8) I am getting the following error: Error: unexpected symbol in: "#run K-Means km" Please help me to eliminate this error. PS: Error causing code is highlighted in above in bold.