[R] Question about "Title"

[David Winsemius]

On Feb 17, 2010, at 1:06 PM, Lu Wang wrote:

> 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?

?substitute


>
> Thank you very much,
> John
>

David Winsemius, MD
Heritage Laboratories
West Hartford, CT