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Evaluate data column
eval_data_col(data, aes_col)
data set to evaluate the data with
Single value from an ggplot2::aes(...) object
ggplot2::aes(...)
Aes mapping with the x and y values switched
# NOT RUN { mapping <- ggplot2::aes(Petal.Length) eval_data_col(iris, mapping$x) # }
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