如何在ggplot2中指定图形的大小与轴标签无关 [英] How to specify the size of a graph in ggplot2 independent of axis labels

问题描述

假设我有一个数据框并想制作一个图

Say I have a data frame and want to make a plot

df <- melt(iris)

p <- ggplot(data = df, aes(x = Species, y = value)) + 
       geom_boxplot() + theme(aspect.ratio = 1)

然后我想用 ggsave() 保存这个情节的 pdf

I then want to use ggsave() to save a pdf of this plot

ggsave(plot = p, width = 3, height = 3, dpi = 300, filename = "not squished axis.pdf")

问题是我想指定绘图本身的尺寸，但独立于轴标签，以便下面指定的绘图在轴的绝对长度方面具有相同的大小和尺寸.

The problem is that I want to specify the dimensions of the plot itself but independently of the axis labels so that the plot specified below will have the same size and dimensions in terms of the absolute length of the axes.

q <- ggplot(data = df, aes(x = Species, y = (value)*10000000)) +
       geom_boxplot() + theme(aspect.ratio = 1)

ggsave(plot = q, width = 3, height = 3, dpi = 300, filename = "squished axis.pdf")

有没有办法轻松做到这一点?

Is there a way to do this easily?

这是一个更接近我想要的轴长度的图示例:

Here is an example of a plot closer to what I would like in terms of the axis lengths:

唯一的问题是，通过改变纵横比，我最终会挤压 y 轴以使 x 轴的长度更接近...

the only problem is that by changing the aspect ratio, I end up squishing the y axis to make the x axis closer to even in length...

推荐答案

使用 ggplotGrob.像这样的:

g1 <- ggplot(...)
g2 <- ggplot(...)

g1grob <- ggplotGrob(g1)
g2grob <- ggplotGrob(g2)

grid.arrange(g1grob, g2grob)

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