or</span></span>
<span><span class="co"># ggplot(iris_num, aes(x = Sepal.Length, y = Species)) + geom_density_ridges()</span></span>
<span></span>
<span><span class="co"># works </span></span>
<span><span class="fu"><a href="https://ggplot2.tidyverse.org/reference/ggplot.html" class="external-link">ggplot</a></span><span class="op">(</span><span class="va">iris_num</span>, <span class="fu"><a href="https://ggplot2.tidyverse.org/reference/aes.html" class="external-link">aes</a></span><span class="op">(</span