[R] barplot error

[Farrel Buchinsky]

I created a dataframe called OSA
here is what it looks like
  no.surgery surgery
0        0.4     6.9
6        0.2     0.3

I have also attached it as an R data file

I cannot understand why I am getting the following error.

> barplot(OSA)
Error in barplot.default(OSA) : 'height' must be a vector or a matrix

OSA is a data.frame which means R should see it as a matrix.
What am I not understanding?

-- 
Farrel Buchinsky
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