r - ggplot2 facet wrap : y-axis scale on the first row only

Question

是否可以将 y 轴添加到 facet wrap，但仅限于第一行，如屏幕截图所示？

我的情节代码:

library(ggplot2)

mydf <- read.csv('https://dl.dropboxusercontent.com/s/j3s5sov98q9yvcv/BPdf_by_NB')

ggplot(data = mydf) +
  geom_line(aes(x = YEARMONTH, y = NEWCONS, group = 1), color="darkseagreen3")  +
  geom_line(aes(x = YEARMONTH, y = DEMOLITIONS, group = 1), color = "black") +
  theme_minimal() + 
  labs(title="New constructions Vs Demolitions (2010 - 2014)\n") +
  theme( axis.line = element_blank(),
         axis.title.x = element_blank(),
         axis.title.y = element_blank(),
         axis.text.x = element_blank(),
         axis.text.y = element_blank()) +
  facet_wrap(~ NB) 

结果:



(我已手动为要放置比例的位置添加了图例)

Answer 1

这个想法来自 this回答。

p <- ggplot(data = mydf) +
    geom_line(aes(x = YEARMONTH, y = NEWCONS, group = 1), color="darkseagreen3")  +
    geom_line(aes(x = YEARMONTH, y = DEMOLITIONS, group = 1), color = "black") +
    theme_minimal() + 
    labs(title="New constructions Vs Demolitions (2010 - 2014)\n") +
    theme( axis.line = element_blank(),
                 axis.title.x = element_blank(),
                 axis.text.x = element_blank()) +
    facet_wrap(~ NB) 

请注意 theme 中的更改调用，以便我们以后可以选择性地删除一些grob。

library(gtable)
p_tab <- ggplotGrob(p)
print(p_tab)

所以我们想要移除除了四个左轴项之外的所有项。有一个 gtable_filter函数使用正则表达式，但编写自己的函数来执行简单的负子集更简单(因为我无法制作正确的正则表达式):

gtable_filter_remove <- function (x, name, trim = TRUE){
    matches <- !(x$layout$name %in% name)
    x$layout <- x$layout[matches, , drop = FALSE]
    x$grobs <- x$grobs[matches]
    if (trim) 
        x <- gtable_trim(x)
    x
}

p_filtered <- gtable_filter_remove(p_tab,name = paste0("axis_l-",5:16),trim=FALSE)

library(grid)
grid.newpage()
grid.draw(p_filtered)