粘贴矢量的字符串索引

Question

这是我的示例代码尝试

  paste(1:2,"x",0:1)

这是输出

[1] "1x0" "2x1"

但这是我期望的输出：

[1] "1x0" "1x1" "2x0" "2x1"

Answer 1

使用expand.grid

apply(expand.grid(1:2,"x",0:1),1,paste,collapse="")
[1] "1x0" "2x0" "1x1" "2x1"