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classa
2009 Dec 03
5
Bar Plots: Error Bars
...de a bar graph and error
bars, but I can't figure out how to align them properly (currently they are
not centered on the bars and some of them aren't even close). Here's the
code that I'm using:
> marks <- sample(4:10, size=50, replace=TRUE)
> dim(marks) <- c(10,5)
> classavg <- colMeans (marks, na.rm=FALSE, dims = 1)
> barplot(classavg, main="Class Average for Quizzes", xlab="Quiz",
> ylab="Average", names = c("1","2","3","4","5"), ylim=c(0,12), axis.lty=1)
box()
> max <- ap...