获取ggplot2图例以在r中显示百分比符号

Question

下面是我要解决的问题的可重现示例。我在 ggplot2 中创建了各种热图，一切进展顺利。由于我在数据上放置了百分号以与 geom_text 一起使用，因此我想让 geom_tile 的图例也显示百分号（我现在只能将实际值乘以 100）。理想情况下，我希望右侧的图例栏显示 8%、4%、0%、-4%、-8%。

#load in libraries
require(plyr)
require(dplyr)
require(reshape2)
require(ggplot2)
require(scales)

testDF <- structure(list(strategies = structure(c(8L, 7L, 6L, 5L, 4L, 3L, 
                                                  2L, 1L), .Label = c("Class 1", "Class 2", 
                                                                      "Class 3", "Class 4", "Class 5", "Class 6", 
                                                                      "Class 7", "Class 8"), class = "factor"), 
                         School1 = c(0.0355662887589396, 0.0316753241146625, 0.00606392341292672, 
                                     0.0250738342627283, -0.0405709181701368, 0.0237665074609996, 
                                     0.00587364885411765, -0.0343914002059331), School2 = c(NA, NA, 
                                                                                            NA, 0.0225535750673764, NA, -0.00448947685878404, NA, -0.0446386763157662
                                     ), School3 = c(NA, NA, NA, 0.0261099462365593, NA, 0.0199735626692146, 
                                                    NA, -0.0272279264519992), School4 = c(NA, NA, NA, 0.0164004151291513, 
                                                                                          NA, 0.00567638888888868, NA, -0.0384017249374949)), .Names = c("schools", 
                                                                                                                                                         "School1", "School2", "School3", "School4"), row.names = c(NA, -8L), class = "data.frame")


GraphMelt <- melt(testDF)
GraphMelt <- GraphMelt %>% mutate(text = sprintf("%1.2f%%", 100*value))
GraphMelt[,"text"] <- ifelse(GraphMelt[,"text"]=="NA%",NA,GraphMelt[,"text"])                                    
p <- ggplot(GraphMelt, aes(variable, schools))
p <- p + geom_tile(aes(fill = value*100), colour =   "white") + geom_text(aes(label=text),size=7)
p <- p + scale_fill_gradient(low = "red", high = "green",limits=c(-8,8))
p <- p + theme(
  axis.text.x= element_text(color="black", size=14, vjust=0.5),
  axis.text.y= element_text(color="black", size=14, vjust=0.5),
  axis.title.y = element_text(color="black",size=14, vjust=0.5),
  plot.title = element_text(color="black",size=14,face="bold", hjust=0.5,vjust=1),
  panel.background = element_blank(),
  legend.position="right",
  legend.title = element_blank(),
  legend.key = element_rect(fill="white"), legend.background = element_rect(fill=NA)
)
p <- p + xlab("") + ylab("") + ggtitle("Schools")

Answer 1

加载 scales 包（你已经有了它，但我想明确说明这个依赖）

library(scales)

并将 labels = percent 添加到您的填充比例（或者如果您出于任何原因不想使用 library(scales)，则使用 scales::percent）。

scale_fill_gradient(low = "red", high = "green", limits = c(-8, 8), labels = percent)

获取ggplot2图例以在r中显示百分比符号

Get ggplot2 legend to display percentage sign in r

r

ggplot2

legend

legend-properties