为特定值分配特定颜色

我要求R制作一系列图。但是，由ggplot2分配给不同变量的颜色因实际数据而异。我需要更多的一致性，特别是我想：为特定值分配特定颜色

四是红色三是绿色二是黄色一个是基于以前的答案我怀疑我需要订购的水平是白色

。有人可以帮我吗？

下面是一些样本数据：

df<-structure(list(`id` = structure(c(3L, 3L, 3L, 3L, 3L, 2L, 
            3L, 3L, 1L, 3L, 4L, 3L, 3L, 3L, 3L, 3L, 2L, 4L, 3L, 3L, 2L, 3L, 
            2L, 4L, 2L, 4L, 3L, 3L, 2L, 3L, 4L, 3L, 3L, 2L, 3L, 3L, 4L, 3L, 
            1L, 3L, 4L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), .Label = c("ONE", 
                           "TWO", "THREE", "FOUR"), class = "factor"), NAME = c("0", "0.25", "0.5", 
                                      "0.75", "1", "1.25", "1.5", "1.75", "2", "2.25", "2.5", "2.75", 
                                      "3", "3.25", "3.5", "3.75", "4", "4.25", "4.5", "4.75", "5", 
                                      "5.25", "5.5", "5.75", "6", "6.25", "6.5", "6.75", "7", "7.25", 
                                      "7.5", "7.75", "8", "8.25", "8.5", "8.75", "9", "9.25", "9.5", 
                                      "9.75", "10", "10.25", "10.5", "10.75", "11", "11.25", "11.5", 
                                      "11.75", "12", "12.25")), .Names = c("id", "NAME"), row.names = c("0", 
                                                       "0.25", "0.5", "0.75", "1", "1.25", "1.5", "1.75", "2", "2.25", 
                                                       "2.5", "2.75", "3", "3.25", "3.5", "3.75", "4", "4.25", "4.5", 
                                                       "4.75", "5", "5.25", "5.5", "5.75", "6", "6.25", "6.5", "6.75", 
                                                       "7", "7.25", "7.5", "7.75", "8", "8.25", "8.5", "8.75", "9", 
                                                       "9.25", "9.5", "9.75", "10", "10.25", "10.5", "10.75", "11", 
                                                       "11.25", "11.5", "11.75", "12", "12.25"), class = c("tbl_df", 
                                                                    "tbl", "data.frame"))

下面是代码：

library(ggplot2) 
library(tidyr) 

colors <- c("red","white","yellow","green") 


df$NAME <- rownames(df) 

x<-gather(df,NAME) 
colnames(x)<-c("Name", "variable","value") 

ggplot(x, 
    aes(x = Name, y = variable, fill = factor(value))) + 
geom_tile() + 
scale_fill_manual(values=colors)+ 
scale_x_discrete(name="Time Period", limits= rownames(df))

来源

2015-06-11 Matthew David Jankowski

您的代码使用的唯一软件包是'ggplot2'和'tidyr'（已编辑）。在将来，不要使用“dput（df）'...将df转换为x的代码......关于如何绘制”x“的问题，只需要'dput（x）'，因为转换是无关紧要的。 – Gregor

Gregor。得到它了。谢谢！ –

我将不得不调查为什么这个标记是重复的。在发布之前，我查看了提到的解决方案。它看起来很近，但没有帮助我看到我需要理解的东西。我认为格里高尔的回答帮助我实现了我目前知识水平的目标...... –

你所需要的，就像你说的，到指定因子水平的顺序：

x$value = factor(x$value, levels = c("ONE", "TWO", "THREE", "FOUR")) 
# the order of the vector you pass to levels defines the order of the factor

然后，您需要按照相同的顺序定义颜色矢量。

# "FOUR to be red THREE to be green TWO to be yellow ONE to be white" 
colors <- c("white","yellow","green","red")

另一种方法是命名颜色矢量（下面），但我更喜欢第一种方式。

colors <- c("red","white","yellow","green") 
names(colors) = c("FOUR", "ONE", "TWO", "THREE") 

colors 
# FOUR  ONE  TWO THREE 
# "red" "white" "yellow" "green"

无论哪种方式，你的绘图代码应该工作得很好。

来源

2015-06-11 19:42:39 Gregor

为特定值分配特定颜色

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