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Remove redundancy, closes #1316

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mine-cetinkaya-rundel 2023-03-02 00:52:42 -05:00
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@ -94,7 +94,7 @@ When `class` is mapped to `shape`, we get two warnings:
Since ggplot2 will only use six shapes at a time, by default, additional groups will go unplotted when you use the shape aesthetic. Since ggplot2 will only use six shapes at a time, by default, additional groups will go unplotted when you use the shape aesthetic.
The second warning is related -- there are 62 SUVs in the dataset and they're not plotted. The second warning is related -- there are 62 SUVs in the dataset and they're not plotted.
Similarly, we can map `class` to `size` or `alpha` (transparency) aesthetics as well. Similarly, we can map `class` to `size` or `alpha` aesthetics as well, which control the shape and the transparency of the points, respectively.
```{r} ```{r}
#| layout-ncol: 2 #| layout-ncol: 2
@ -125,8 +125,6 @@ Both of these produce warnings as well:
Mapping a non-ordinal discrete (categorical) variable (`class`) to an ordered aesthetic (`size` or `alpha`) is generally not a good idea because it implies a ranking that does not in fact exist. Mapping a non-ordinal discrete (categorical) variable (`class`) to an ordered aesthetic (`size` or `alpha`) is generally not a good idea because it implies a ranking that does not in fact exist.
Similarly, we could have mapped `class` to the `alpha` aesthetic, which controls the transparency of the points, or to the `shape` aesthetic, which controls the shape of the points.
Once you map an aesthetic, ggplot2 takes care of the rest. Once you map an aesthetic, ggplot2 takes care of the rest.
It selects a reasonable scale to use with the aesthetic, and it constructs a legend that explains the mapping between levels and values. It selects a reasonable scale to use with the aesthetic, and it constructs a legend that explains the mapping between levels and values.
For x and y aesthetics, ggplot2 does not create a legend, but it creates an axis line with tick marks and a label. For x and y aesthetics, ggplot2 does not create a legend, but it creates an axis line with tick marks and a label.