在ggplot2中访问现有绘图的轴刻度矢量 [英] Accessing vector of axis ticks for an existing plot in ggplot2
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问题描述
我想在ggplot的现有图中获取坐标轴刻度值的向量。我知道ggplot对象是一个包含9个元素的列表,我想知道是否可以从该列表中提取轴蜱的值。例如,如果我生产这个玩具的例子:
library(ggplot2)
g = ggplot(data = mtcars,aes( hp,mpg))+ geom_point()
我想要的是矢量
c(100,200,300)
c(10,15,20,25,30,35)
分别用于x ticks和y ticks w
有没有办法去做这件事?
非常感谢!
解决方案
这些值可以在
ggplot_build(g)$ panel $ ranges [[1]] $ x.major_source
#[1] 100 200 300
和
ggplot_build(g)$ panel $ ranges [[1] ] $ y.major_source
#[1] 10 15 20 25 30 35
ggplot_build(g)$ panel $ ranges [[1]] $ x.labels
#[1]100 200300
ggplot_build(g)$ panel $ ranges [[1]] $ y.labels
#[1]1015202530 35
I would like to get the vector of values for axis ticks in an existing plot in ggplot. I know that a ggplot object is a list with 9 elements and I was wondering if somehow I could extract the values for the axis ticks from that list. For example if I produce this toy example:
library(ggplot2)
g=ggplot(data=mtcars,aes(hp,mpg))+geom_point()
What I want are the vectors
c(100,200,300)
c(10,15,20,25,30,35)
for x ticks and y ticks respectively w
Is there a way to to this?
Many thanks!
解决方案
Those values can be found in
ggplot_build(g)$panel$ranges[[1]]$x.major_source
#[1] 100 200 300
and
ggplot_build(g)$panel$ranges[[1]]$y.major_source
#[1] 10 15 20 25 30 35
They can also be found stored as characters here:
ggplot_build(g)$panel$ranges[[1]]$x.labels
#[1] "100" "200" "300"
ggplot_build(g)$panel$ranges[[1]]$y.labels
#[1] "10" "15" "20" "25" "30" "35"
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