我想創建一個數據框的情節,它的列名包含特殊字符。請看下面的例子:ggplot2:如何繪製包含特殊字符的列?
f <- data.frame(foo=c(1, 2, 3), bar=c(4, 5, 6))
# The following line works fine
ggplot(f) + geom_point(aes_string(x="foo", y="bar"))
names(f) <- c("foo", "bar->baz")
# The following also works, but seems not elegant
ggplot(f) + geom_line(aes(x=foo, y=f[,"bar->baz"]))
# I'd like something like the following, but this doesn't work.
ggplot(f) + geom_line(aes_string(x="foo", y="bar->baz"))
最後一條命令的輸出是:
Error in eval(expr, envir, enclos) : object 'bar' not found
有誰知道創建這個情節的一種方式?或者這只是一個limitation of ggplot?