How to GET (not set) axis min and max from a ggplot?

Asked Feb 09 '21 at 00:51

Active Feb 09 '21 at 00:51

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I want to get the xmin and xmax of an existing ggplot. But ggplot2 functions like xlim() only set this, they don't return the value from an existing plot.

Exploring the plot structure using names(p) and str(p) shows some candidate helpers (ggproto functions like get_scale() but unclear how these could be used.

Axis limits must be stored when they are set, but I can't see how to access them.

For ease of repro:

p = ggplot2::qplot(wt, mpg, data = mtcars)

# is it possible to access the xmin and xmax from p?

asked Feb 09 '21 at 00:51

tim

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Does this answer your question? [Extract data from a ggplot](https://stackoverflow.com/questions/25378184/extract-data-from-a-ggplot) – LMc Feb 09 '21 at 00:54
You can do `ggplot_build(p)$layout$panel_scales_x[[1]]$range$range` – Maurits Evers Feb 09 '21 at 00:56
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Note that limits `ggplot_build(p)$layout$coord$limits` are NULL unless you set them. – neilfws Feb 09 '21 at 01:01

How to GET (not set) axis min and max from a ggplot?

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