Documentation of arguments to guide_axis is unclear

Apparently, order has to be numeric. However, this is not checked. Passing a character simply gives a warning ("NAs introduced by coercion").
There is no example of order nor of position.

I tried to add a secondary axis on the same side as the primary axis as follows:

ggplot(mtcars, aes(hp, mpg)) +
  geom_point() +
  scale_y_continuous(
    sec.axis = sec_axis(trans = ~ 235.215 / ., name = "l/100 km",
                        guide = guide_axis(order = 2, position = "left")))

This leads to a warning: "Discarding guide on merge. Do you have more than one guide with the same position?" And the secondary axis is not drawn. So it seems that I did not fully understand the use of order and position yet...

See also: #4650 (comment). Where it is suggested, that the primary axis should automatically take the opposite position of the secondary axis.

I'll incorporate an explicit type and length check for the order argument in #4879. Though I think the order argument only matters for axis guides when there are multiple guides for the same position. That makes the guide_axis() documentation a bit weird.

Fix tidyverse#4958

Convert guides to ggproto (#4879)

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Documentation of arguments to `guide_axis` is unclear #4958

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Documentation of arguments to guide_axis is unclear #4958

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jarauh commented on Aug 23, 2022

teunbrand commented on Sep 3, 2022

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Documentation of arguments to `guide_axis` is unclear #4958