
Title | Looping over parallel lists | |
Author | Kevin Crow, StataCorp |
You can loop over parallel lists in Stata using the forvalues command and the extended macro function : word #. For example, let us say that you had two lists, cat dog cow pig and meow woof moo oinkoink. In a loop, you would like to have the first iteration be cat and meow, the second iteration be dog and woof, etc. Below is the forvalues command you would use.
. local agrp "cat dog cow pig" . local bgrp "meow woof moo oinkoink" . local n : word count `agrp' . forvalues i = 1/`n' { 2. local a : word `i' of `agrp' 3. local b : word `i' of `bgrp' 4. di "`a' says `b'" 5. } cat says meow dog says woof cow says moo pig says oinkoink