我正在尝试绘制每个方面都有自己的图例的方面。但是，我很难将它们全部正确对齐。
dat <- structure(list(group1 = structure(c(1L, 1L, 2L, 2L, 2L), .Label = c("A",
"B"), class = "factor"), group2 = structure(c(1L, 2L, 1L, 3L,
2L), .Label = c("a", "b", "c"), class = "factor"), x = c("1",
"2", "3", "4", "2"), y = c("1", "2", "3", "4", "3")), .Names = c("group1",
"group2", "x", "y"), row.names = c(NA, 5L), class = "data.frame")
dat <- split(dat, f = dat$group1)
library(ggplot2)
p1 <- ggplot(dat$A) +
geom_point(aes(x=x, y=y, colour=group2)) +
facet_wrap(~group1) +
guides(colour=guide_legend(nrow=2)) +
scale_colour_manual(values=c(a = "green", b = "red", c = "blue"),
labels=c(a = "green", b = "red", c = "blue"))
p2 <- p1 %+% dat$B
使用gridExtra问题是图不对齐：
library(gridExtra)
grid.arrange(p1, p2, p2, p1, ncol=2)
并且使用cowplot图例有点居中：
library(cowplot)
plot_grid(p1, p2, p2, p1, ncol=2, align="hv")
我尝试添加legend.justification和/或legend.position但没有效果。
如何使两个图/图例对齐？
