色轴文字按变量

问题描述

我想根据数据集中的另一个变量来更改热图轴文本的颜色.到目前为止，这是我尝试过的:

I'd like to vary the color of my heatmap axis text depending on another variable in the dataset. This is what I've tried so far:

#load data, scale numeric columns, add state abbreviation and region
state_data <- data.frame(state.x77)
state_data <- state_data[,1:8]
state_data <- rescaler(state_data, type='range')
state_data$State <- state.abb
state_data$Region <- state.region

#make heatmap
melted_state <- melt(state_data,id.vars=c('State', 'Region'))

p <- ggplot(melted_state, 
        aes(x=State, y=variable))
p <- p + geom_tile(aes(fill = value), colour = "white")
p <- p + theme(axis.text.x=element_text(colour="Region")) ## doesn't work!
p

我收到此错误:grid.Call(L_textBounds，as.graphicsAnnot(x $ label)，x $ x，x $ y，中的错误: 无效的颜色名称区域"

I get this error:Error in grid.Call(L_textBounds, as.graphicsAnnot(x$label), x$x, x$y, : invalid color name 'Region'

如果我删除区域"周围的引号，则会出现此错误:

And if I remove the quotes around 'Region' I get this error:

Error in structure(list(family = family, face = face, colour = colour,  : 
  object 'Region' not found

我该怎么做?

推荐答案

不幸的是，无法将通过theme访问的设置映射到数据.您将需要手动构建适当的颜色调色板(读取:列表).

Settings accessed via theme cannot be mapped to the data like aesthetics unfortunately. You will need to construct an appropriate palette (read: list) of colors manually.

这样做的一种方法是:

library(scales)
numColors <- length(levels(melted_state$Region)) # How many colors you need
getColors <- scales::brewer_pal('qual') # Create a function that takes a number and returns a qualitative palette of that length (from the scales package)
myPalette <- getColors(numColors)
names(myPalette) <- levels(state_data$Region) # Give every color an appropriate name
p <- p + theme(axis.text.x = element_text(colour=myPalette[state_data$Region])))

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