[R] R Help finding Mean

B77S bps0002 at auburn.edu
Thu Sep 1 15:55:52 CEST 2011

see ?mean
Then avoid other peoples code. 

cenae27 wrote:
> bob<-read.csv('shi.csv', header=T)
> newmean<-matrix(0, test, dim(bob)[2]-6);a<-0; for (i in
> c(4,8:(dim(bob)[2])))
> {a<-a+1;newmean[,a]<-tapply(bob[,i], bob$Exam, mean)}
> colnames(newmean)<-colnames(bob)[c(4,8:(dim(bob)[2]))]
> Could anyone please help me what does the above code does ... I want to
> find mean ... but would like to know what exactly is the above code doing.
> Thanks for your help.
> Cenae

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