[英]How to add titles to each plot created from lapply in R?
我試圖將變量名稱(即x,y和z)添加為每個箱形圖的標題:
bpdf = data.frame(group=c("A","A","A","B","B","B","C","C","C"),
x=c(1,1,2,2,3,3,3,4,4),
y=c(7,5,2,9,7,6,3,1,2),
z=c(4,5,2,9,8,9,7,6,7))
par(mfrow=c(1,3))
lapply(bpdf[-1],function(x){
y <- sort(tapply(x,bpdf$group,median),decreasing=TRUE)
boxplot(x~factor(bpdf$group,levels=names(y)),
main=paste(colnames(bpdf[-1])))
})
我在main
電話中遺漏了一些東西(請為以前的幫助提供幫助)。
當前方法的問題在於,當循環遍歷列(data.frame /列表項)時,列名本身會丟失,如下所示:
devnull <- lapply(bpdf[-1], print)
# [1] 1 1 2 2 3 3 3 4 4
# [1] 7 5 2 9 7 6 3 1 2
# [1] 4 5 2 9 8 9 7 6 7
因此,您不必遍歷列,而可以遍歷變量名:
par(mfrow = c(1, ncol(bpdf) - 1)
lapply(names(bpdf)[-1], function(var){
x <- bpdf[[var]]
y <- sort(tapply(x, bpdf$group, median), decreasing = TRUE)
boxplot(x ~ factor(bpdf$group,levels=names(y)), main = var)
})
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