r - Duplicating (and modifying) discrete axis in ggplot2 -


i want duplicate left-side y-axis on ggplot2 plot onto right side, , change tick labels discrete (categorical) axis.

i've read answer this question, can seen on package's repo page, switch_axis_position() function has been removed cowplot package (the author cited (forthcoming?) native functionality in ggplot2).

i've seen reference page on secondary axes in ggplot2, examples in document use scale_y_continuous rather scale_y_discrete. and, indeed, when try use discrete function, error:

error in discrete_scale(c("y", "ymin", "ymax", "yend"), "position_d",  :  unused argument (sec.axis = <environment>)

is there anyway ggplot2? hacked solution suffice me. in advance. (mres below)

library(ggplot2)  # working continuous plot 2 axes ggplot(mtcars, aes(cyl, mpg))  +      geom_point() +      scale_y_continuous(sec.axis = sec_axis(~.+10))   # working discrete plot 1 axis ggplot(mtcars, aes(cyl, as.factor(mpg)))  +      geom_point()    # broken discrete plot 2 axes ggplot(mtcars, aes(cyl, as.factor(mpg)))  +      geom_point() +     scale_y_discrete(sec.axis = sec_axis(~.+10))

take discrete factor , represent numerically. can mirror , relabel ticks factor levels instead of numbers.

library(ggplot2)  irislabs1 <- levels(iris$species) irislabs2 <- c("foo", "bar", "buzz")  ggplot(iris, aes(sepal.length, as.numeric(species))) +   geom_point() +   scale_y_continuous(breaks = 1:length(irislabs1),                      labels = irislabs1,                      sec.axis = sec_axis(~.,                                          breaks = 1:length(irislabs2),                                          labels = irislabs2))

then fiddle expand = argument in scale needed more closely imitate default discrete scale.

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