R Language: Modify Variables Tutorial

In R language, to modify edited content, you can achieve it by reassigning the value. For example, if you have already defined a variable x and want to modify its value, you can use the following code:

x <- 5  # 定义变量x为5
x <- 10  # 修改变量x的值为10

If you want to modify the contents of a data structure such as a vector or data frame, you can achieve this by reassigning values. For example, if you have already defined a vector v and want to modify the value of a specific element, you can use the following code:

v <- c(1, 2, 3, 4, 5)  # 定义向量v
v[3] <- 10  # 修改第三个元素的值为10

Similarly, if you need to change the content of a specific cell in a data frame, you can achieve that by reassigning the value. For example, if you have already defined a data frame df and want to modify the value in the second row and third column, you can use the following code:

df <- data.frame(a = c(1, 2, 3), b = c("a", "b", "c"))
df[2, 3] <- "x"  # 修改第二行第三列的值为"x"

Simply put, to modify the edited content, all you need to do is reassign it.