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RE: st: RE: a "byable" cii


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: a "byable" cii
Date   Fri, 7 Feb 2003 09:37:28 -0000

Vince Wiggins,

> Just a quick followup to Nick Cox's <n.j.cox@durham.ac.uk> 
> solution of
> Paul Visintainer's <visint@nymc.edu> problem on repeating 
> calls to -cii- for
> many observations.  Nick suggested,
> 
> 
> >       forval i = 1/100 { 
> >             local n = num[`i'] 
> >             local d = den[`i'] 
> >             cii `d' `n' 
> >       } 
> 
> In Stata 8, we collapse the three lines in Nick's loop into one,
> 
>       forval i = 1/100 { 
>             cii `=num[`i']' `=den[`i']'
>       } 
> 
> The new local macro expansion directive `= ...' causes 
> whatever lies between
> the = and the closing quote (') to be evaluated as an 
> expression and its
> result placed in the command.  This can be convenient when 
> you want to
> evaluate an expression, or fetch a value that is only 
> available in an
> expression context, in a place where the command wants to 
> see a numeric or
> string literal.  I rarely use the directive to evaluate 
> long expressions, but
> it can be convenient for short ones.  
> 
> Another common usage might be,
> 
>       forvalues j = 1/`_N' {
>             ...
 

Quite right, except that last line should be 

       forvalues j = 1/`=_N' {


Nick 
n.j.cox@durham.ac.uk 
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