I'm trying to build a simple histogram with ggplot2 package in R.
I'm loading my data from a csv file and putting 2 of the columns together in a data frame, like this:
df = data.frame(sp = data$species, cov = data$totalcover)
sp is recognised as a factor of 23 levels (my number of lines) and cov as 23 numbers.
Then, to build the histogram, I'm executing this:
ggplot(df, aes(df$sp, df$cov) + geom_histogram())
However, R returns the error: "Error: Mapping should be created with aes()
or aes_()
."
How is this possible if I'm already using aes? Is it maybe related with the type of the values?
Best Answer
I had the same error, even if I was using aes(). So I used "mapping" before aes()