不要丢弃零计数:躲避条形图 [英] Don't drop zero count: dodged barplot

问题描述

我在 ggplot2 中制作了一个躲避的条形图，一个分组的计数为零，我想显示.我记得不久前在 HERE 上看到了这个并想出了 scale_x_discrete(drop=F) 会起作用.它似乎不适用于躲避条.如何显示零计数?

I am making a dodged barplot in ggplot2 and one grouping has a zero count that I want to display. I remembered seeing this on HERE a while back and figured the scale_x_discrete(drop=F) would work. It does not appear to work with dodged bars. How can I make the zero counts show?

例如(下面的代码)在下图中，type8~group4 没有示例.我仍然希望绘图显示零计数的空白空间，而不是消除条形.我该怎么做?

For instance, (code below) in the plot below, type8~group4 has no examples. I would still like the plot to display the empty space for the zero count instead of eliminating the bar. How can I do this?

mtcars2 <- data.frame(type=factor(mtcars$cyl), 
    group=factor(mtcars$gear))

m2 <- ggplot(mtcars2, aes(x=type , fill=group))
p2 <- m2 + geom_bar(colour="black", position="dodge") +
        scale_x_discrete(drop=F)
p2

推荐答案

我所知道的唯一方法是预先计算计数并添加一个虚拟行:

The only way I know of is to pre-compute the counts and add a dummy row:

dat <- rbind(ddply(mtcars2,.(type,group),summarise,count = length(group)),c(8,4,NA))

ggplot(dat,aes(x = type,y = count,fill = group)) + 
    geom_bar(colour = "black",position = "dodge",stat = "identity")

我认为使用 stat_bin(drop = FALSE,geom = "bar",...) 会起作用，但显然它不起作用.

I thought that using stat_bin(drop = FALSE,geom = "bar",...) instead would work, but apparently it does not.

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