[R] Change the scale on a barplot's y axis

[Thomas Levine]

Yay! That's perfect. Thanks, Steve!

Tom

2010/2/27 S Ellison <S.Ellison at lgc.co.uk>:
> Thomas,
>
> You could perhaps do a tad better by simply adding a right-hand-side
> axis using axis():
>
> axis(4, at=c(4.3,4.0,3.7, 3.3,3.0,2.7, 2.3,2.0,1.7, 1.3,1.0,0.7),
> labels=c('A+','A','A-','B+','B','B-','C+','C','C-','D+','D','D-'),
> las=1)
>
> That way you have both numeric and grade scales.
>
> if you want a left-hand grade scale only, first suppress the axes in the
> barplot using axes=FALSE, and then add the axes using axis(1) and
> axis(2,..) with the ... as above.
>
> Incidentally, I'm not sure I'd have converted your numbers that way, but
> if it's worked it's worked.
>
> Steve E
>>>> Thomas Levine <thomas.levine at gmail.com> 02/28/10 12:44 AM >>>
> I have grades data. I read them from a csv in letter-grade format. I
> then converted them to levels
>
> levels(grades$grade)=c('A+','A','A-','B+','B','B-','C+','C','C-','D+','D','D-')
>
> And then to numbers
>
> grades$gp=grades$grade
> levels(grades$gp)=c(4.3,4.0,3.7, 3.3,3.0,2.7, 2.3,2.0,1.7, 1.3,1.0,0.7)
> grades$gp=as.numeric(as.character(grades$gp))
>
> And I'm plotting them in a barplot
>
> barplot(gp[order(gp)],width=n[order(gp)],ylab="Class Median
> Grade",xlab="Class, scaled to number of students in the
> class",main="Class Median Grades for Cornell University weighted by
> class size")
>
> I would like to change the scale on the bar graph such that it reads
>
> c('A+','A','A-','B+','B','B-','C+','C','C-','D+','D','D-')
>
> in the locations
>
> c(4.3,4.0,3.7, 3.3,3.0,2.7, 2.3,2.0,1.7, 1.3,1.0,0.7)
>
> Any ideas?
>
> Tom
>
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