无法在 R 中分配多个行变量

Question

我目前正在尝试学习 R，但遇到了一个可能很愚蠢的问题，但我找不到解决方案

我使用 RStudio，当我尝试分配一个变量时，我可以分配一行。 例如，如果我尝试运行（我选择所有行并单击“运行”按钮）此代码

age_survived <- summarise(group_by(train, Age, Survived), count=n())
    age_survived[which(age_survived$Survived==1), ] 
    rename(age_survived, "n_survived"="count")

它单独运行这些行并将变量“age_survived”分配给仅第一行

所以我试着写这样的代码

 age_survived <- {
    summarise(group_by(train, Age, Survived), count=n())
    age_survived[which(age_survived$Survived==1), ] 
    rename(age_survived, "n_survived"="count")
 }

但是这样我得到了这个错误

错误：找不到对象“age_survived”

代码工作的唯一方式是这样

age_survived <- summarise(group_by(train, Age, Survived), count=n())
age_survived <- age_survived[which(age_survived$Survived==1), ] 
age_survived <- rename(age_survived, "n_survived"="count")

我不认为这是这样做的方法，我做错了什么？

Answer 1

Pipes 可能就是您要找的。 此代码应该适用于您应该使用的 train.csv 数据。

age_survived <- summarise(group_by(train, Age, Survived), count=n()) %>%
  filter(Survived == 1) %>%
  rename("n_survived" = "count")