此处的基本问题是如何在lattice中的堆叠条形图中添加标签.答案在此问题中提供，但是由于链接的答案没有多个面板，因此我使用以下方法重新创建了一个更简单的答案在此处以R为底

The underlying question here is how to add labels to a stacked barchart in lattice. The answer is provided in this question, but since the linked answer doesn't have multiple panels, I recreate a simpler answer using base R here:

您必须按如下方式修改面板功能:

You have to modify the panel function as follows:

• 为每个y值计算x值的累加和
• 这是经典的拆分，应用，合并问题.您可以为此使用plyr(如链接的答案中所示)，或者如我所说明的那样，使用split和do.call:

• Calculate the cumulative sum of x values for each y value
• This is a classic split, apply, combine problem. You can use plyr for this (as in the linked answer), or, as I illustrate, split and do.call:

xx <- do.call(c, unname(lapply(split(x, y), function(t)cumsum(t)-t/2)))

代码:

barchart( 1:10 ~ Petal.Width + Petal.Length | Species, 
          data = iris[c(1:10, 51:60, 101:110), ], 
          stack = TRUE,
          panel=function(x, y, ...) {
            panel.barchart(x, y, ...)
            xx <- do.call(c, unname(lapply(split(x, y), function(t)cumsum(t)-t/2)))
            ltext(xx, y=y, labels=x)
         }
)