How do I process parallel lists?
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Title
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Looping over parallel lists
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Author
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Kevin Crow, StataCorp
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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
