R ggplot：facet中的不同geom_ablines [英] R ggplot: Different geom_ablines in facets

问题描述

我想绘制两个不同的

Y截距不受影响。

而不是 yintercept 。此外，您需要映射 aes 中的两个值，否则设置 slope 将覆盖您使用 AES 。这样做：


$ b

library（ggplot2）
dummy1< - expand.grid（X = factor（c（A，B）），Y = rnorm（10））
dummy1 $ D < - rnorm（nrow（dummy1））
dummy2 < - data.frame（X = c（A，B），Z = c（1,0））

ggplot（dummy1，aes（x = D， y = Y））+
geom_point（）+
facet_grid（〜X）+
geom_abline（data = dummy2，aes（截距= Z，斜率= 1））


I want to draw two different geom_ablines in my two facets. Which seem to be working differently to the geom_hline - which is answered here.

While

library(ggplot2)
dummy1 <- expand.grid(X = factor(c("A", "B")), Y = rnorm(10))
dummy1$D <- rnorm(nrow(dummy1))
dummy2 <- data.frame(X = c("A", "B"), Z = c(1, 0))
ggplot(dummy1, aes(x = D, y = Y)) + geom_point() + facet_grid(~X) + 
    geom_hline(data = dummy2, aes(yintercept = Z))

.. works, this:

library(ggplot2)
dummy1 <- expand.grid(X = factor(c("A", "B")), Y = rnorm(10))
dummy1$D <- rnorm(nrow(dummy1))
dummy2 <- data.frame(X = c("A", "B"), Z = c(1, 0))
ggplot(dummy1, aes(x = D, y = Y)) + geom_point() + facet_grid(~X) + 
   geom_abline(data = dummy2, aes(yintercept = Z), slope = 1)

does not:

Y-intercept is not affected.

解决方案

For geom_abline you need intercept and not yintercept. Furthermore, you need to map both values inside aes, otherwise setting slope overrides what you set with aes. This works:

library(ggplot2)
dummy1 <- expand.grid(X = factor(c("A", "B")), Y = rnorm(10))
dummy1$D <- rnorm(nrow(dummy1))
dummy2 <- data.frame(X = c("A", "B"), Z = c(1, 0))

ggplot(dummy1, aes(x = D, y = Y)) +
  geom_point() +
  facet_grid(~X) + 
  geom_abline(data = dummy2, aes(intercept = Z, slope = 1))

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