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我無法爲最後一個字幕(pm10)創建下標。我如何能夠利用下午並創建下標「10」。目前標題是pm10。如何在ggplot2的facet網格標題中使用下標
library(dlnm)
library(ggplot2)
library(reshape2)
library(plyr)
data <- chicagoNMMAPS
data1<-data[c(1,7:9,13)]
dmelt = melt(data1, id.vars = 'date')
ggplot(dmelt, aes(x = date, y = value)) +
geom_line() +
theme_bw() +
facet_wrap(~ variable, scales = 'free_y', ncol = 1)+
theme(strip.text.x = element_text(size=14,face="bold"),
strip.background = element_rect(colour="")) +
labs(x = "Date") +
theme(axis.title=element_text(face="bold",size="14"),axis.text=element_text(size=14,face="bold")) +
theme(#panel.grid.major = element_blank(),
panel.grid.minor = element_blank(),
strip.background = element_blank(),
panel.border = element_rect(colour = "black"))