如何在ggplot2中将百分比四舍五入到小数点后两位 [英] How to round percentage to 2 decimal places in ggplot2

问题描述

我的代码生成此图:

代码:

ggplot(areas, aes(x = RETAILER, y = Difference), label=sprintf("%0.2f", round(areas$Difference, digits = 2))) +
geom_bar(stat = "identity", aes(fill = RETAILER), colour = "black") +
scale_y_continuous("Percentage", labels = percent_format()) +
geom_text(aes(label = paste(Difference * 100, "%"),
              vjust = ifelse(Difference >= 0, -1.5, 1.5))) +
theme_classic()

我找到了使数据标签正确放置在每个小节上方或下方的代码，但是我似乎无法将值四舍五入到小数点后两位.

I have found code to allow the data labels to be positioned correctly above or below each bar, but I cannot seem to get the values to round to 2 decimal places.

我尝试了round(areas, 2)和sprintf("%0.2f")等其他方法，但是我尝试的任何方法似乎都无效，并且我确定我缺少一些简单的方法.

I have tried round(areas, 2) and sprintf("%0.2f") among other things, but nothing I try seems to work and I'm sure that I'm missing something simple.

我要去哪里错了?

更新:

有了罗兰的鼓励"，我现在设法几乎解决了这个问题；现在的问题是我现在丢失了百分号:

With Roland's "encouragement", I have now managed to almost resolve this; the problem now is that I have now lost the percentage signs:

我如何找回他们?

更新的代码:

ggplot(areas, aes(x = RETAILER, y = Difference)) +
  geom_bar(stat = "identity", aes(fill = RETAILER), colour = "black") +
  scale_y_continuous("Percentage", labels = percent_format()) +
  geom_text(aes(label = sprintf("%0.2f", areas$Difference * 100, "%"),
                vjust = ifelse(Difference >= 0, -1.5, 1.5))) +
  theme_classic()

推荐答案

ggplot2/scales软件包的最新版本为scales::percent函数提供了参数，例如将百分比四舍五入为整数:

Recent versions of ggplot2/scales packages offer arguments to the scales::percent function, for instance to round percentages to integers:

scale_y_continuous(labels = scales::percent_format(accuracy = 1L))

这大致等同于round(x, 0L):请注意1而不是0.

This is roughly equivalent to round(x, 0L): Note the 1 instead of 0.

或两位数:

scale_y_continuous(labels = scales::percent_format(accuracy = 3L))

有一个几乎重复的问题.在此处查看Henrik的答案:如何防止小数位数::百分比加小数

There is a near-duplicate question. Check Henrik's answer here: How to prevent scales::percent from adding decimal

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