Question

我正在笔记本电脑上复制DataCamp中的代码：

 library(xts) 
 plot.zoo(flights_xts, plot.type = "multiple", ylab = labels)
 plot.zoo(flights_xts, plot.type = "single", lty = lty)
 legend("right", lty = lty, legend = labels)

并且在执行上面三行代码时出现以下错误：

Error in rep(ylab, length.out = ngraph) : 
attempt to replicate an object of type 'closure'

Error in strwidth(legend, units = "user", cex = cex, font = text.font) : 
cannot coerce type 'closure' to vector of type 'character'

Answer 1

在函数参数中使用引号（＆＃34;。＆＃34;）时，错误已得到修复：

plot.zoo(flights_xts, plot.type = "multiple", ylab = "labels")
plot.zoo(flights_xts, plot.type = "single", lty = "lty")
legend("right", lty = "lty", legend = "labels")

虽然在线DataCamp.com环境中这些引号不是必需的，但它仍然很有趣。对此有何评论？

Answer 2

似乎为该任务预定义了datacamp.com对象lty和标签。对我来说有用：

lty <- c(1, 2, 3, 4)
labels <- c("Total", "Delay", "Cancel", "Divert")

plot.zoo（）出错：“尝试复制'闭包'类型的对象”

2 个答案: