Hi, 

I want to produce a pie chart with titles. I used the following code. So it created a pie chart for the percentage of the score for ID="002".


ID <-
c("001","001","002","002","002","003","003","003","004","004","005","005","006")
test <-
c("A","B","A","B","C","A","B","C","A","B","A","B","A")
score <- c(60,90,32,56,89,45,77,82,68,79,56,77,90)
mydata <- data.frame(ID,test,score)
score_002 <- score[mydata$ID=="002"]
lbls <- round(score_002/sum(score_002)*100)
lbls <- paste(lbls,"%",sep="")
par(mar=c(4,4,4,4),oma=c(0,0,0,0))
pie(score_002,labels=lbls,radius=0.5)
title(main="Pie chart of score",font.main=3,cex.main=1,line=-2.6)
title(main="(Total score: 177)",font.main=3,cex.main=0.8,line=-3.6)
title(main="ID is 002",font.main=3,cex.main=0.9,line=-22)
As you can see in the title:"(Total score: 177)" and "ID is 002" is inserted by hand. If I want to change the ID to "003" and let R produce the corresponding score sum and ID: 003. How can I do this? Is there any built-in function or I need to write my own function? 

Thank you very much,
John


      
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