粘贴矢量的字符串索引

Question

This is my example code attempt

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

This is the output

[1] "1x0" "2x1"

But this is my Desired output:

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

Answer 1

Using expand.grid

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