在一项调查中，有一个问题是“课程的哪个方面对您学习概念帮助最大？选择所有适用的”
以下是回复列表的样子：
Student_ID = c(1,2,3)
Responses = c("lectures,tutorials","tutorials,assignments,lectures", "assignments,presentations,tutorials")
Grades = c(1.1,1.2,1.3)
Data = data.frame(Student_ID,Responses,Grades);Data
Student_ID | Responses | Grades
1 | lectures,tutorials | 1.1
2 | tutorials,assignments,lectures | 1.2
3 | assignments,presentations,tutorials | 1.3
现在我想创建一个看起来像这样的数据框
Student_ID | Lectures | Tutorials | Assignments | Presentation | Grades
1 | 1 | 1 | 0 | 0 | 1.3
2 | 1 | 1 | 1 | 0 | 1.4
3 | 0 | 1 | 1 | 1 | 1.3 …