2

可能重复：
在 facet_wrap 图中添加“浮动”轴标签

数据链接： https ://www.dropbox.com/s/q45t9hng4mryi6y/GTAP_CCShocks2.csv

代码：

   # Loading the data
   climshocks <- read.csv(file = "F:/Purdue University/RA_Position/PhD_ResearchandDissert/PhD_Draft/GTAP-CGE/GTAP_NewAggDatabase/NewFiles/GTAP_CCShocks2.csv", header=TRUE, sep=",", na.string="NA", dec=".", strip.white=TRUE)

   # Data manipulations
   ccshocks <- as.data.frame(climshocks)
   ccshocks[4:4] <- sapply(ccshocks[4:4],as.numeric)
   ccshocks <- droplevels(ccshocks)
   ccshocks <- transform(ccshocks,region=factor(region,levels=unique(region)))

   library(reshape)
   library(ggplot2)
   library(grid)

   #--------------------------------------------------------------------------------
   #### Average of climate-induced yield percent change for all regions by crop
   #--------------------------------------------------------------------------------

   #_Code_Begin...
   Avgccshocks.f <- melt(ccshocks)
   Avgccshocks.f <- Avgccshocks.f[Avgccshocks.f$sres %in% c("AVERAGE"), ]

   PlotAvgccshocks <- ggplot(data = Avgccshocks.f, aes(factor(region), value))
   PlotAvgccshocks + geom_bar(stat="identity") + 
   theme(axis.text.x = element_text(colour = 'black', angle = 90, size = 14, hjust = 0.5, vjust = 0.5),axis.title.x=element_blank()) + 
   ylab("Yield(%change)") + theme(axis.text.y = element_text(colour = 'black', size = 14, hjust = 0.5, vjust = 0.5), axis.title.y = element_text(size = 14, hjust = 0.5, vjust = 0.5, face = 'bold')) + 
   theme(strip.text.x = element_text(size = 16, hjust = 0.5, vjust = 0.5, face = 'bold')) +
   facet_wrap(~crops, scales="free_y", ncol=3)
   ggsave("PlotAvgccshocks.png")

   #_Code_End...

结果： 结果图

我的问题： ggplot 中有没有办法将标签添加到最后两列下的 x 轴。我知道我可以通过在 facet_wrap() 中将“free_y”替换为“free”来做到这一点，但这会将标签添加到图中的所有面板中，这会使其不友好。

我正在寻找的是在剩下的两列正下方添加标签，或者添加两组 x 轴标签，但与“wht”面板的标签处于同一级别。

我希望我的问题很清楚。

提前致谢。

PS：我尝试使用 Julius 创建的函数来响应在 facet_wrap 图中添加“浮动”轴标签来解决问题，代码如下

    #7- Function to add x-axis labels to all plots using facet_wrap()
    #----------------------------------------------------------------

    library(grid)
    # pos - where to add new labels
    # newpage, vp - see ?print.ggplot
    facetAdjust <- function(x, pos = c("up", "down"), 
                    newpage = is.null(vp), vp = NULL)
    {
    # part of print.ggplot
    ggplot2:::set_last_plot(x)
    if(newpage)
    grid.newpage()
    pos <- match.arg(pos)
    p <- ggplot_build(x)
    gtable <- ggplot_gtable(p)

    # finding dimensions
    dims <- apply(p$panel$layout[2:3], 2, max)
    nrow <- dims[1]
    ncol <- dims[2]

    # number of panels in the plot
    panels <- sum(grepl("panel", names(gtable$grobs)))
    space <- ncol * nrow

    # missing panels
    n <- space - panels

    # checking whether modifications are needed
    if(panels != space){

    # indices of panels to fix
    idx <- (space - ncol - n + 1):(space - ncol)

    # copying x-axis of the last existing panel to the chosen panels  
    # in the row above

    gtable$grobs[paste0("axis_b",idx)] <- list(gtable$grobs[[paste0("axis_b",panels)]])
    if(pos == "down"){
    if pos == down then shifting labels down to the same level as 
    # the x-axis of last panel
    rows <- grep(paste0("axis_b\\-[", idx[1], "-", idx[n], "]"), 
               gtable$layout$name)
    lastAxis <- grep(paste0("axis_b\\-", panels), gtable$layout$name)
    gtable$layout[rows, c("t","b")] <- gtable$layout[lastAxis, c("t")]}}

    # again part of print.ggplot, plotting adjusted version
    if(is.null(vp)){
    grid.draw(gtable)}
    else{
    if (is.character(vp)) 
    seekViewport(vp)
    else pushViewport(vp)
    grid.draw(gtable)
    upViewport()}
    invisible(p)}

所以，基本上我为“facetAdjust()”函数运行此代码并为我的绘图“PlotAvgccshocks”调用它，但弹出一条错误消息，如下所示：

错误信息：

facetAdjust（PlotAvgccshocks）错误：绘图中没有图层

有什么想法吗？

再次感谢

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0 回答 0