R ggplot透明度 - alpha值取决于其他变量 [英] R ggplot transparency - alpha values conditional on other variable

问题描述

我有以下数据：[来自R graphics Cookbook的例子]

I have the following data: [example from R graphics Cookbook]

Cultivar Date Weight sd          n  se          big
c39     d16   3.18  0.9566144   10  0.30250803  TRUE
c39     d20   2.8   0.2788867   10  0.08819171  TRUE
c39     d21   2.74  0.9834181   10  0.3109841   TRUE
c52     d16   2.26  0.4452215   10  0.14079141  FALSE
c52     d20   3.11  0.7908505   10  0.25008887  TRUE
c52     d21   1.47  0.2110819   10  0.06674995  FALSE

我想要一个条形图其中透明度依赖于大变量。

I would like to have a bar plot where bar transparency depends on big variable.

我尝试了以下方法，我尝试设置 alpha 值取决于不同的 big 值：

I have tried the following, where I tried to set alpha values depending on different big values:

ggplot(cabbage_exp, aes(x=Date, y=Weight, fill=Cultivar)) +
  geom_bar(position="dodge", stat="identity")
ggplot(cabbage_exp, aes(x=Date, y=Weight, fill=Cultivar)) +
  geom_bar(position="dodge", stat="identity", alpha=cabbage_exp$big=c("TRUE"= 0.9, "FALSE" = 0.35)) 
ggplot(cabbage_exp, aes(x=Date, y=Weight, fill=Cultivar)) +
 geom_bar(position="dodge", stat="identity", alpha=big=c("TRUE"= 0.9, "FALSE" = 0.35))

我想根据大变量的值在条中设置不同的透明度。任何帮助或指导极大的赞赏！

I would like to have different transparency in the bars depending on the value of the big variable. Any help or guidance hugely appreciated!

推荐答案

使用 scale_alpha_discrete 的另一种可能性，其中范围参数可用于为每个'big'级别设置所需的 alpha 值。

Another possibility using scale_alpha_discrete, where the range argument may be used to set your desired alpha values for each level of 'big'.

ggplot(data = cabbage_exp, aes(x = Date, y = Weight, fill = Cultivar, alpha = big)) +
  geom_bar(position = "dodge", stat = "identity") +
  scale_alpha_discrete(range = c(0.35, 0.9))

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