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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