使轴线从 ggplot 中的具体值开始
原标题：Make axis lines start from specific values in ggplot
I have the following scatterplot in ggplot:
library(ggplot2)
ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width)) +
geom_point() +
theme_classic() +
scale_y_continuous(limits = c(2, 5)) +
scale_x_continuous(limits = c(4, 8))
My question is: what parameter should i tweak to make the axis.line.x and axis.line.y start respectively from the points x=4 and y=2?
I tried with coord_cartesian(expand=FALSE) and with scale_y_continuous(expand=c(0,0)) but the result is that the axis limits are being reduced to the value i put on the limits parameter.
Keep in mind that I don t want to create an Origin with x=4 and y=2 in the same point, i just want to remove from this plot only the black line that connect the x axis with the y axis, like in the following plot:
,
where there is blank space below 0.01 for both axis.
问题回答
ggplot2 gives you two ways to manipulate the scale. coord_* functions (coord_cartesian typically) and scale_(x/y)_* functions
In the coord_ case you can set expand=FALSE,
In the scale_ case you can set expand=c(0,0)
to remove the default expansions
You can achieve your desired result using the cap= argument of guide_axis (introduced with ggplot2 3.5.0) which allows to cap the axis at the first break (aka "lower") or the last break (aka "upper") break or "both".
library(ggplot2)
ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width)) +
geom_point() +
theme_classic() +
scale_y_continuous(limits = c(2, 5), guide = guide_axis(cap = "lower")) +
scale_x_continuous(limits = c(4, 8), guide = guide_axis(cap = "lower"))
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