I'm an absolute beginner at R, so please excuse the simplicity of this question. I'm having trouble loading a file in R and making a histogram plot from a column of data. Here's my code:

library('ggplot2')
df <- read.csv('/PATH/TO/FILE', sep=' ', head=FALSE)
vals <- df[,2]
qplot(df, data=vals, geom="histogram")

Error: ggplot2 doesn't know how to deal with data of class numeric

Can anyone show me what the problem is? Thanks in advance for the help.

r ggplot2
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