如何显示在热图单元格中的数值单元格的值
问题描述:
我试图创建一个热图来显示驱动每个单元格中颜色的值。如果一个单元格由于有5个观测值而呈深蓝色,我想看到该单元格中的数字5。如何显示在热图单元格中的数值单元格的值
(目的是建立一个信用评级迁移矩阵,其中一个轴是今年的信用评级,另一个是去年的信用评级。输入是一个数据框,其中每行是一个公司的观察值,公司的信用以及去年的信用评级,矩阵显示哪些公司在两年期间信用评级稳定,评级较低,并且评级更高。
下面是数据和代码
require(ggplot2)
# Create a dataframe mm where each row is one observation for one company,
# the company's credit rating this year, and it credit rating last year. A company ID is
# provided.
mm<-data.frame(
CompamyID = c(1:14),
CurrentYear =c("Aaa","Aa","B","Baa","C","Aaa","Aa","B","Baa","C","Aa","B","Baa","C"),
PreviousYear=c("Aaa","Aa","B","Baa","Aa","B","Baa","C","C","Aaa","Aa","B","Baa","C"),
Count=rep(1,14)
)
# Create heatmap and show the number of observations in each cell.
# I have used label= # sum() for illustration but it is wrong.
ggplot(data=mm, aes(x = mm$CurrentYear, y=mm$PreviousYear)) +
geom_bin2d() +
geom_text(aes(fill = mm$Count, label = sum(mm$Count)))+
scale_x_discrete(limits =c("Aaa", "Aa", "A", "Baa", "Ba", "B", "Caa", "Ca", "C")) +
scale_y_discrete(limits=c("C","Ca","Caa","B","Ba", "Baa", "A", "Aa", "Aaa")) +
scale_fill_gradient2() +
theme(panel.grid.major = element_line(colour ="white", size = 0.5))+
theme(panel.grid.minor = element_line(colour ="black", linetype ="dashed", size = 0.5)) +
theme(panel.background = element_rect(colour ="black", fill ="white",size = 1.0)) +
ggtitle("MIGRATION MATRIX USING geom_bin2d()") +
xlab("Current Year") +
ylab("Previous Year")
答
我会用stat_bin2d
所以ggplot2
内部计算的计数,使他们的名字..count..
下可用。
ggplot(data=mm, aes(x = mm$CurrentYear, y=mm$PreviousYear)) +
geom_bin2d() +
stat_bin2d(geom="text", aes(label=..count..))+
scale_x_discrete(limits =c("Aaa", "Aa", "A", "Baa", "Ba", "B", "Caa", "Ca", "C")) +
scale_y_discrete(limits=c("C","Ca","Caa","B","Ba", "Baa", "A", "Aa", "Aaa")) +
scale_fill_gradient2() +
theme(panel.grid.major = element_line(colour ="white", size = 0.5))+
theme(panel.grid.minor = element_line(colour ="black", linetype ="dashed", size = 0.5)) +
theme(panel.background = element_rect(colour ="black", fill ="white",size = 1.0)) +
ggtitle("MIGRATION MATRIX USING geom_bin2d()") +
xlab("Current Year") +
ylab("Previous Year")
我希望有帮助。
是的,它的工作!谢谢,我真的很感激。 – user3118031 2014-10-03 12:46:50
如果你喜欢它,不要忘记upvote并接受答案。 – juba 2014-10-03 13:13:24
对于R 3.1.1有没有类似于'stat_bin2d'的东西?我想获得它的独立性,因为我得到警告'> install.packages(“stat_bin2d”)将软件包安装到'/ usr/local/lib/R/site-library' (as'lib'is unspecified)Warning message :包'stat_bin2d'不可用(对于R版本3.3.1)' – 2016-11-01 16:15:55