如何删除R中的$美元符号

Question

我怎样才能去掉美元符号？查看数据我已经尝试了很多东西但没有任何效果。

我将 sales_revenue 列分为 sales_revenue_A、sales_revenue_B、sales_revenue_C、sales_revenue_D。查看图像。

使用了如下函数：as.nummeric 和 gsub 但我收到错误这是我第一次使用 R。

Answer 1

这是一个dplyr解决方案，df您的数据框在哪里：

df %>% 
  mutate(across(starts_with("Sales"), ~gsub("\\$", "", .) %>% as.numeric))

mutate创建一个新列，across(starts_with("Sales")引用以“Sales”开头的列，并且波形符~开始该gsub函数，它将“$”的所有实例替换为空（即“”）。

当然，如果你想保存为新的数据框，你需要调用：

dfnew <- df %>% 
      mutate(across(starts_with("Sales"), ~gsub("\\$", "", .) %>% as.numeric))

样本数据：

structure(list(Sales_revenue1 = c("$100", "$100", "$100", "$100", 
"$100", "$100", "$100", "$100", "$100", "$100", "$100", "$100", 
"$100", "$100", "$100", "$100", "$100", "$100", "$100", "$100", 
"$100", "$100", "$100", "$100", "$100", "$100", "$100", "$100", 
"$100", "$100", "$100", "$100"), Sales_revenue2 = c("$200", "$200", 
"$200", "$200", "$200", "$200", "$200", "$200", "$200", "$200", 
"$200", "$200", "$200", "$200", "$200", "$200", "$200", "$200", 
"$200", "$200", "$200", "$200", "$200", "$200", "$200", "$200", 
"$200", "$200", "$200", "$200", "$200", "$200"), Sales_revenueB = c("$300", 
"$300", "$300", "$300", "$300", "$300", "$300", "$300", "$300", 
"$300", "$300", "$300", "$300", "$300", "$300", "$300", "$300", 
"$300", "$300", "$300", "$300", "$300", "$300", "$300", "$300", 
"$300", "$300", "$300", "$300", "$300", "$300", "$300")), row.names = c(NA, 
-32L), class = "data.frame")