1
我想构建一个R闪亮的应用程序,其中有用户为模型选择变量。用户选择的元素被放入向量中。我如何删除引号以及在他们选择的每个元素之间放置空格,以便成为模型中的变量?以R中的引号取出元素
举个例子:
> vars <- c("cyl", "disp", "hp")
> my.model <- lm(mpg ~ paste(vars, collapse = "+"), data = mtcars)
给出了错误:
Error in model.frame.default(formula = mpg ~ paste(vars, collapse = "+"), :
variable lengths differ (found for 'paste(vars, collapse = "+")')
从阅读#2等有点类似的问题,有人建议使用as.name()来删除引号,但这会产生另一个错误:
> 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 = "+"))'