我正在为报告创建多个分面图。构面的数量在2到8之间变化。理想情况下,我希望每个构面的绝对大小(跨图)都相同(例如4x4厘米),以便比较它们(看起来也更好) )。
那可能吗?
df1 <- structure(list(group1 = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L,1L, 1L, 1L, 1L, 1L), .Label = c("S1", "S2"), class = "factor"), group = structure(c(1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L), .Label = c("A", "B", "C", "D", "E"), class = "factor"), value = 1:12), class = "data.frame", row.names = c(NA, -12L), .Names = c("group1", "group", "value"))
df2 <- structure(list(group1 = structure(c(2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .Label = c("S1", "S2"), class = "factor"), group = structure(c(4L, 4L, 4L, 4L, 5L, 5L, 5L, 5L), .Label = c("A", "B", "C", "D", "E"), class = "factor"), value = 13:20), class = "data.frame", row.names = c(NA, -8L), .Names = c("group1", "group", "value"))
library(ggplot2)
plot1 <- ggplot(df1) + geom_histogram(aes(x=value)) + facet_wrap(~group)
plot2 <- ggplot(df2) + geom_histogram(aes(x=value)) + facet_wrap(~group)
最佳答案
为此,我使用了以下功能,
set_panel_size <- function(p=NULL, g=ggplotGrob(p), file=NULL,
margin = unit(1,"mm"),
width=unit(4, "cm"),
height=unit(4, "cm")){
panels <- grep("panel", g$layout$name)
panel_index_w<- unique(g$layout$l[panels])
panel_index_h<- unique(g$layout$t[panels])
nw <- length(panel_index_w)
nh <- length(panel_index_h)
if(getRversion() < "3.3.0"){
# the following conversion is necessary
# because there is no `[<-`.unit method
# so promoting to unit.list allows standard list indexing
g$widths <- grid:::unit.list(g$widths)
g$heights <- grid:::unit.list(g$heights)
g$widths[panel_index_w] <- rep(list(width), nw)
g$heights[panel_index_h] <- rep(list(height), nh)
} else {
g$widths[panel_index_w] <- rep(width, nw)
g$heights[panel_index_h] <- rep(height, nh)
}
if(!is.null(file))
ggsave(file, g,
width = grid::convertWidth(sum(g$widths) + margin,
unitTo = "in", valueOnly = TRUE),
height = grid::convertHeight(sum(g$heights) + margin,
unitTo = "in", valueOnly = TRUE))
g
}
g1 <- set_panel_size(plot1)
g2 <- set_panel_size(plot2)
gridExtra::grid.arrange(g1,g2)
关于r - 在ggplot2中设置构面的绝对大小,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/32580946/