On 02/28/2010 11:44 AM, Thomas Levine wrote:
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)
Hi Tom,
You can do this directly using the height.at and height.lab arguments in
the barp function in the plotrix package.
Jim
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