Looping over pair

[James Park]

Is it possible to loop over a pair rather than one each? For example, as a hypothetical code, I would write like this

foreach (X,Y) in ("His" "Mother")  ("His" "Father") ("Her" "Father")  {

}

If I do

foreach X in "His" "Her" {
foreach Y in "Mother" "Father" {

}

then it will waste time on looping over "Her" "Mother", which I do not need.

[Liu Qiang]

hello, maybe you can first generate a new variable using -egen group- and then loop. Will it be possible?

[daniel klein]

Since I have no clue what you are really trying to do, I cannot comment on whether the approach is a good one. Anyway, here is an example that does what I believe you want to do

foreach x in "a b" "a c" "d c" {
    display "pair: `x'"
    tokenize `x'
    args one two
    display "one: `one'"
    display "two: `two'"
}

Best
Daniel

[Nick Cox]

This works too:

foreach x in "a b" "a c" "d c" {
    display word("`x'", 1) 
    display word("`x'", 2) 
}