Al <[email protected]> asks:
> Can the -foreach- command be nested? Stata crashes if I try to put a
> foreach inside another foreach.
>
> for example:
>
> local N "0 5 10";
> local Y "y1 y2 y3";
> foreach n in `N'
> {foreach y in `Y'
> {reg `y' X if t>`n' } };
And Nick Cox <[email protected]> has answered showing how it
should be done.
I would just like to clarify that in Stata 8 you get an error
message, not a crash.
. do examp
. #delimit ;
delimiter now ;
. local N "0 5 10";
. local Y "y1 y2 y3";
. foreach n in `N'
> {foreach y in `Y'
> {reg `y' X if t>`n' } };
program error: code follows on the same line as open brace
r(198);
end of do-file
r(198);
And, the error message gives a clue as to the problem.
One other thing to be aware of using the semicolon as the delimiter,
is to remember to put one after the curly braces.
foreach n in `N' { ;
foreach y in `Y' { ;
reg `y' X if t > `n' ;
} ;
} ;
otherwise it is as if they were on the same line as whatever follows.
Ken Higbee [email protected]
StataCorp 1-800-STATAPC
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