Passing column names from a different data frame to ggplot

Question

I want to pass to ggplot an x and a y variable where the names come from another data frame.

I thought it would be possible to use the aes_string() argument and pass the column names from data1 but use the data from data2.

data(iris)
data1 <- iris
data2 <- data

dev.off()
ggplot() +
  geom_point(aes_string(
    x = rlang::eval_tidy(colnames(data1)[1]),
    y = rlang::eval_tidy(colnames(data1)[2])
  ), data = data2
  )

How can I pass the variable names using something similar to eval_tidy?

akrun · Accepted Answer · 2020-02-11 19:22:08Z

2

We can convert to symbol and evaluate (!!) in aes

library(ggplot2)
ggplot() +
  geom_point(aes(
    x = !!rlang::sym(colnames(data1)[1]),
    y = !!rlang::sym(colnames(data1)[2])), data = data2)

NOTE: aes_string is getting deprecated. So, either we pass unquoted argument as quosure and evaluate (!!) or use {{...}} or with strings, convert to symbol and evaluate

answered Feb 11, 2020 at 19:22

akrun

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