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Re: st: Need help with working with multiple files


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Need help with working with multiple files
Date   Tue, 28 May 2013 08:40:51 +0100

If you refer to a macro that doesn't exist Stata doesn't regard that
as an error: it just substitutes nothing, or equivalently ignores the
reference.

Nested macro references don't affect this principle and indeed must be
consistent with it. So if  local macro x does not exist as a string to
be used neither do any of

`x'
``x''
```x''''

and so forth. You could say that they define empty strings if you
like, but the effect is the same: a non-existent string and an empty
string look identical.



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