Vince Wiggins,
> Just a quick followup to Nick Cox's <[email protected]>
> solution of
> Paul Visintainer's <[email protected]> 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
[email protected]
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