生成R中所有可能的行组合？

Question

假设我有两个数据框,学生和老师.

students <- data.frame(name = c("John", "Mary", "Sue", "Mark", "Gordy", "Joey", "Marge", "Sheev", "Lisa"),
                   height = c(111, 93, 99, 107, 100, 123, 104, 80, 95),
                   smart = c("no", "no", "yes", "no", "yes", "yes", "no", "yes", "no"))
teachers <- data.frame(name = c("Ben", "Craig", "Mindy"),
                   height = c(130, 101, 105),
                   smart = c("yes", "yes", "yes"))

我希望生成所有可能的学生和教师组合并保留随附的信息,基本上创建数据框"学生"和"教师"的所有行组合.这可以通过循环和cbind轻松完成,但对于大型数据帧,这需要永远.帮助一个R新手 - 最快的方法是什么？

编辑:如果这不清楚,我希望输出具有以下格式:

rbind(
  cbind(students[1, ], teachers[1, ]), 
  cbind(students[1, ], teachers[2, ]) 
  ...
  cbind(students[n, ], teachers[n, ]))

Answer 1

您可以将所有数据合并如下：

do.call(cbind.data.frame,Map(expand.grid,teacher=teachers,students=students))

   name.teacher name.students height.teacher height.students smart.teacher smart.students
1           Ben          John            130             111           yes             no
2         Craig          John            101             111           yes             no
3         Mindy          John            105             111           yes             no
4           Ben          Mary            130              93           yes             no
5         Craig          Mary            101              93           yes             no
6         Mindy          Mary            105              93           yes             no
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