1
我想構建一個R閃亮的應用程序,其中有用戶爲模型選擇變量。用戶選擇的元素被放入向量中。我如何刪除引號以及在他們選擇的每個元素之間放置空格,以便成爲模型中的變量?以R中的引號取出元素
舉個例子:
> vars <- c("cyl", "disp", "hp")
> my.model <- lm(mpg ~ paste(vars, collapse = "+"), data = mtcars)
給出了錯誤:
Error in model.frame.default(formula = mpg ~ paste(vars, collapse = "+"), :
variable lengths differ (found for 'paste(vars, collapse = "+")')
從閱讀#2等有點類似的問題,有人建議使用as.name()來刪除引號,但這會產生另一個錯誤:
> vars <- c("cyl", "disp", "hp")
> my.model <- lm(mpg ~ as.name(paste(vars, collapse = "+")), data = mtcars)
Error in model.frame.default(formula = mpg ~ as.name(paste(vars, collapse = "+")), :
invalid type (symbol) for variable 'as.name(paste(vars, collapse = "+"))'