Question

Ok this should be easy but I can NOT figure it out. I have data that is called avePrice (using diamond information in ggplot2):

Fair      Good Very Good   Premium     Ideal 
282.0    3050.5    2648.0    3181.0    1809.0

I want to plot, using the headings (the first row) on the x-axis as labels and the values (second row) on the y-axis.

This seems it should be easy in R but I cannot seem to figure it out!

I can do this

qplot(x=c("Fair", "Good", "Very Good", "Premium",  "Ideal"), y=avePrice, geom="bar", xlab="Diamond Cut", ylab="Average Price")

which works, but it would seem there HAS to be a simple way to do this without typing in the xlabels manually? Hopefully?

Thanks in advance… I’m expecting to feel dumb when someone points out how 🙂

Clarification: I know I can move the x=c(“Fair…”) stuff out of the qplot command and have it elsewhere, but I still am having to manually enter it at that point.

Answer 1

You can directly plot this using ggplot2 without having to calculate the average prices by cut. Here is a one-liner

qplot(cut, price, data = diamonds, stat = 'summary', fun.y = 'mean')