是否有用于删除列中特定数据片段的 R 函数？

Question

So I have a data frame that includes a column like this: image

And I would like to remove the operator as well as the numbers to the right of it, ie so the first entry would just say 51.81 rather than 51.81 - 11.19. How would I go about this? I feel like using a for loop might work but I'm unsure of the syntax required.

Thanks

Answer 1

我们可以使用sub来匹配零个或多个空格 ( \\\\s* ) 后跟-或+等字符，并替换为空白 ( "" )

df1$xG <- as.numeric(sub("\\s*[-+]+.*", "", df1$xG))