R:在R data.frame中将字符转换为数字

# 创建一个包含字符列的data.frame
df <- data.frame(name = c("John", "Alice", "Bob"),
                 age = c("25", "30", "35"),
                 stringsAsFactors = FALSE)

# 将字符列转换为数字类型
df$age <- as.numeric(df$age)

# 打印转换后的data.frame
print(df)

  name age
1 John  25
2 Alice 30
3   Bob 35