向格子条形图中的面板添加文本 [英] Adding text to panels in lattice barchart

问题描述

我尝试在具有多个面板的格状条形图中向条形添加标签.我最终得到了太多标签(每个标签都在每个面板中).

I try to add labels to bars in a lattice barchart with multiple panels. I end up with way too many labels (every label is in every panel).

这是我的代码:

library(lattice)
data(iris)

barchart(seq(1,50) ~ Petal.Width + Petal.Length | Species, data = iris, stack = TRUE,
         panel=function(x, y, ...) {
               panel.barchart(x, y, ...);
               ltext(x=iris$Petal.Width/2, y=y, labels=iris$Petal.Width, cex = 0.5);
               ltext(x=iris$Petal.Width + iris$Petal.Length/2, y=y, labels=iris$Petal.Width, cex = 0.5);
         }
)

我该怎么做?

额外问题:
除了它没有按预期工作之外，我认为我的代码效率不是很高(尤其是 seq(1,50) 和 Petal.Width + Petal.Length).有没有更好的办法?

Bonus question:
Beside it does not work as expected, I think my code is not too efficient (especially seq(1,50) and Petal.Width + Petal.Length). Is there a better way?

提前谢谢你！！！

推荐答案

这里的基本问题是如何在 lattice 中为堆叠的条形图添加标签.this question 中提供了答案，但由于链接的答案没有多个面板，我使用重新创建一个更简单的答案此处为基础 R:

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:

你必须修改面板功能如下:

You have to modify the panel function as follows:

• 计算每个 y 值的 x 值的累积和
• 这是一个经典的拆分、应用、组合问题.您可以为此使用 plyr (如链接答案中所示)，或者，如我所示，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)
         }
)

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