在base
图形中,我们可以使用axis
和side
参数轻松地在图表的不同侧面添加刻度线:
par(tck = 0.025)
plot(1:10)
axis(side = 3, labels = FALSE)
axis(side = 4, labels = FALSE)
如何在ggplot2
的顶部和右侧镜像x和y轴刻度线?有annotation_logticks
可以做到这一点,但似乎只适用于对数比例(因为函数的名称适用)。对于线性刻度,是否有类似的简单方法?
答案 0 :(得分:12)
从ggplot2 2.2.0开始,您可以使用sec.axis
中的scale_
参数。
dup_axis
是创建辅助轴的简写,辅助轴是主轴的复制,有效地镜像主轴。
ggplot(data = mpg, aes(x = displ, y = hwy)) +
geom_point() +
scale_x_continuous(sec.axis = dup_axis()) +
scale_y_continuous(sec.axis = dup_axis())
答案 1 :(得分:4)
这反映了轴刻度线(使用gtable
函数),并将刻度线放在绘图面板内。
2016年4月18日编辑 axis.ticks.margin
已弃用。改为使用文字边距。
编辑19 Mrch 2015 :更好地定位刻度线
library(ggplot2) # v2.1.0
library(gtable) # v0.2.0
library(grid)
# Get a plot
p = ggplot(data.frame(x = 1:10, y = 1:10), aes(x,y)) +
geom_point() +
theme_bw() +
theme(panel.grid = element_blank(),
axis.ticks.length=unit(-0.25, "cm"),
axis.text.x = element_text(margin = margin(t = .5, unit = "cm")),
axis.text.y = element_text(margin = margin(r = .5, unit = "cm")))
# Convert the plot to a grob
gt <- ggplotGrob(p)
# Get the position of the panel in the layout
panel <-c(subset(gt$layout, name=="panel", se=t:r))
## For the bottom axis
# Get the row number of the bottom axis in the layout
rn <- which(gt$layout$name == "axis-b")
# Extract the axis (tick marks only)
axis.grob <- gt$grobs[[rn]]
axisb <- axis.grob$children[[2]] # Two children - get the second
axisb # Note: two grobs - tick marks and text
# Get the tick marks
xaxis = axisb$grobs[[1]] # NOTE: tick marks first
xaxis$y = xaxis$y - unit(0.25, "cm") # Position them inside the panel
# Add a new row to gt, and insert the revised xaxis grob into the new row.
gt <- gtable_add_rows(gt, unit(0, "lines"), panel$t-1)
gt <- gtable_add_grob(gt, xaxis, l = panel$l, t = panel$t, r = panel$r, name = "ticks")
## Repeat for the left axis
# Get the row number of the left axis in the layout
panel <-c(subset(gt$layout, name=="panel", se=t:r))
rn <- which(gt$layout$name == "axis-l")
# Extract the axis (tick marks and axis text)
axis.grob <- gt$grobs[[rn]]
axisl <- axis.grob$children[[2]] # Two children - get the second
axisl # Note: two grobs - text and tick marks
# Get the tick marks
yaxis = axisl$grobs[[2]] # NOTE: tick marks second
yaxis$x = yaxis$x - unit(0.25, "cm") # Position them inside the panel
# Add a new column to gt, and insert the revised yaxis grob into the new column.
gt <- gtable_add_cols(gt, unit(0, "lines"), panel$r)
gt <- gtable_add_grob(gt, yaxis, t = panel$t, l = panel$r+1, name = "ticks")
# Turn clipping off
gt$layout[gt$layout$name == "ticks", ]$clip = "off"
# Draw it
grid.draw(gt)
答案 2 :(得分:0)
这不能解决离散问题,但是辅助轴不必是主轴的重复。因此,在“ side = 4”上,我可以对“ side = 2”轴进行转换。
在此处查看更多信息: https://ggplot2.tidyverse.org/reference/sec_axis.html
例如scale_y_continuous(sec.axis = sec_axis(〜。+ 10))