使用下面代码创建并查看roster数据集,将第一个人名“John Davis”改成自己的名字,例如“Liu yichen”。 Student <- c("John Davis", "Angela Williams", "Bullwinkle Moose", "David Jones", "Janice Markhammer", "Cheryl Cushing","Reuven Ytzrhak", "Greg Knox", "Joel England", "Mary Rayburn") Math <- c(502, 600, 412, 358, 495, 512, 410, 625, 573, 522) Science <- c(95, 99, 80, 82, 75, 85, 80, 95, 89, 86) English <- c(25, 22, 18, 15, 20, 28, 15, 30, 27, 18) roster <- data.frame(Student, Math, Science, English, stringsAsFactors=FALSE)
时间: 2024-02-23 08:03:31 浏览: 22
你好,以下是代码实现:
```
# 创建数据集
Student <- c("John Davis", "Angela Williams", "Bullwinkle Moose", "David Jones", "Janice Markhammer", "Cheryl Cushing","Reuven Ytzrhak", "Greg Knox", "Joel England", "Mary Rayburn")
Math <- c(502, 600, 412, 358, 495, 512, 410, 625, 573, 522)
Science <- c(95, 99, 80, 82, 75, 85, 80, 95, 89, 86)
English <- c(25, 22, 18, 15, 20, 28, 15, 30, 27, 18)
roster <- data.frame(Student, Math, Science, English, stringsAsFactors=FALSE)
# 将第一个人名改为“Liu yichen”
roster$Student[1] <- "Liu yichen"
# 查看数据集
roster
```
结果如下:
```
Student Math Science English
1 Liu yichen 502 95 25
2 Angela Williams 600 99 22
3 Bullwinkle Moose 412 80 18
4 David Jones 358 82 15
5 Janice Markhammer 495 75 20
6 Cheryl Cushing 512 85 28
7 Reuven Ytzrhak 410 80 15
8 Greg Knox 625 95 30
9 Joel England 573 89 27
10 Mary Rayburn 522 86 18
```
可以看到第一个人名已经被改为了“Liu yichen”。