使用gridExtra排列许多图
  我花了很多时间试图在一个阴谋中安装11张图表,并使用gridExtra安排,但是我失败了,所以我希望你能帮上忙。 
  我有11个钻石分类(称为size1 )和其他11个分类( size2 ),我想绘制每个不断增加的size1的中间价格和增加的clarity (从1到6)的变化情况,钻石的size1增加size2 ,所有11个图表在同一个图表中。  我尝试使用gridExtra在其他帖子中建议,但传说是远离右边,所有图形都挤在左边,你能帮我弄清楚gridExtra中传说的“宽度”是如何指定的吗?  我找不到任何好的解释。  非常感谢你的帮助,我真的很感激... 
  我一直在试图找到一个很好的例子来重新创建我的数据框,但在这方面也失败了。  我希望这个数据框有助于理解我想要做的事情,我无法使其工作,并且与我的工作一样,并且一些地块没有足够的数据,但重要的部分是使用gridExtra处理图表(虽然如果你对其他部分有其他评论,请告诉我): 
library(ggplot2)
library(gridExtra)
df <- data.frame(price=matrix(sample(1:1000, 100, replace = TRUE), ncol = 1))
df$size1 = 1:nrow(df)
df$size1 = cut(df$size1, breaks=11)
df=df[sample(nrow(df)),]
df$size2 = 1:nrow(df)
df$size2 = cut(df$size2, breaks=11)
df=df[sample(nrow(df)),]
df$clarity = 1:nrow(df)
df$clarity = cut(df$clarity, breaks=6)
# Create one graph for each size1, plotting the median price vs. the size2 by clarity:
for (c in 1:length(table(df$size1))) {
  mydf = df[df$size1==names(table(df$size1))[c],]
  mydf = aggregate(mydf$price, by=list(mydf$size2, mydf$clarity),median);   
  names(mydf)[1] = 'size2'
  names(mydf)[2] = 'clarity'
  names(mydf)[3] = 'median_price'
  assign(paste("p", c, sep=""), qplot(data=mydf, x=as.numeric(mydf$size2), y=mydf$median_price, group=as.factor(mydf$clarity), geom="line", colour=as.factor(mydf$clarity), xlab = "number of samples", ylab = "median price", main = paste("region number is ",c, sep=''), plot.title=element_text(size=10)) + scale_colour_discrete(name = "clarity")  + theme_bw() + theme(axis.title.x=element_text(size = rel(0.8)), axis.title.y=element_text(size = rel(0.8)) , axis.text.x=element_text(size=8),axis.text.y=element_text(size=8) ))
  }
# Couldnt get some to work, so use:
p5=p4
p6=p4
p7=p4
p8=p4
p9=p4
# Use gridExtra to arrange the 11 plots:
g_legend<-function(a.gplot){
tmp <- ggplot_gtable(ggplot_build(a.gplot))
leg <- which(sapply(tmp$grobs, function(x) x$name) == "guide-box")
legend <- tmp$grobs[[leg]]
return(legend)}
mylegend<-g_legend(p1)
grid.arrange(arrangeGrob(p1 + theme(legend.position="none"),
                     p2 + theme(legend.position="none"),
                     p3 + theme(legend.position="none"),
                     p4 + theme(legend.position="none"),
                     p5 + theme(legend.position="none"),
                     p6 + theme(legend.position="none"),
                     p7 + theme(legend.position="none"),
                     p8 + theme(legend.position="none"),
                     p9 + theme(legend.position="none"),
                     p10 + theme(legend.position="none"),
                     p11 + theme(legend.position="none"),
                     main ="Main title",
                     left = ""), mylegend, 
                    widths=unit.c(unit(1, "npc") - mylegend$width, mylegend$width), nrow=1)
  我必须稍微改变qplot循环调用( qplot因素放在数据框中),因为它会抛出不匹配的大小错误。  我不包括那一点,因为那部分显然是在你的环境中工作,或者它是一个错误的粘贴。 
  尝试调整widths单位,如下所示: 
widths=unit(c(1000,50),"pt")
你会得到更接近你可能期待的东西:
而且,我可以在几个月后粘贴代码:-)
library(ggplot2)
library(gridExtra)
df <- data.frame(price=matrix(sample(1:1000, 100, replace = TRUE), ncol = 1))
df$size1 = 1:nrow(df)
df$size1 = cut(df$size1, breaks=11)
df=df[sample(nrow(df)),]
df$size2 = 1:nrow(df)
df$size2 = cut(df$size2, breaks=11)
df=df[sample(nrow(df)),]
df$clarity = 1:nrow(df)
df$clarity = cut(df$clarity, breaks=6)
# Create one graph for each size1, plotting the median price vs. the size2 by clarity:
for (c in 1:length(table(df$size1))) {
  mydf = df[df$size1==names(table(df$size1))[c],]
  mydf = aggregate(mydf$price, by=list(mydf$size2, mydf$clarity),median);   
  names(mydf)[1] = 'size2'
  names(mydf)[2] = 'clarity'
  names(mydf)[3] = 'median_price'
  mydf$clarity <- factor(mydf$clarity)
  assign(paste("p", c, sep=""), 
         qplot(data=mydf, 
               x=as.numeric(size2), 
               y=median_price, 
               group=clarity, 
               geom="line", colour=clarity, 
               xlab = "number of samples", 
               ylab = "median price", 
               main = paste("region number is ",c, sep=''), 
               plot.title=element_text(size=10)) + 
           scale_colour_discrete(name = "clarity") + 
           theme_bw() + theme(axis.title.x=element_text(size = rel(0.8)), 
                              axis.title.y=element_text(size = rel(0.8)), 
                              axis.text.x=element_text(size=8),
                              axis.text.y=element_text(size=8) ))
}
# Use gridExtra to arrange the 11 plots:
g_legend<-function(a.gplot){
  tmp <- ggplot_gtable(ggplot_build(a.gplot))
  leg <- which(sapply(tmp$grobs, function(x) x$name) == "guide-box")
  legend <- tmp$grobs[[leg]]
  return(legend)}
mylegend<-g_legend(p1)
grid.arrange(arrangeGrob(p1 + theme(legend.position="none"),
                         p2 + theme(legend.position="none"),
                         p3 + theme(legend.position="none"),
                         p4 + theme(legend.position="none"),
                         p5 + theme(legend.position="none"),
                         p6 + theme(legend.position="none"),
                         p7 + theme(legend.position="none"),
                         p8 + theme(legend.position="none"),
                         p9 + theme(legend.position="none"),
                         p10 + theme(legend.position="none"),
                         p11 + theme(legend.position="none"),
                         top ="Main title",
                         left = ""), mylegend, 
             widths=unit(c(1000,50),"pt"), nrow=1)

  编辑 (16/07/2015): gridExtra > = 2.0.0时, main参数已重新命名为top 。 
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