使用R中的列表向数据框中的列添加重复内容

Question

您好，简单的R问题但是如果让List_A中的每个项目在数据框架中重复List_B中的每个项目，最佳方法是什么？

List_A = c("a","b","c") 
List_B = c("one","oneb","two","twoa","three","threea") 

所需的输出：

data.frame(List_A = c("a","a","a","a","a","a","b","b","b","b","b","b","c","c","c",,"c","c","c"), 
List_B = c("one","oneb","two","twob","three","threeb","one","oneb","two","twob","three","threeb","one","oneb","two","twob","three","threeb")) 

Answer 1

以下@HubertL的建议后，我能够与反复List_B得到数据框。

expand.grid(List_A=List_A, List_B=List_B)