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Re: st: local and loops
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: local and loops
Date
Tue, 20 Aug 2013 20:05:19 +0100
How many spaces are there between "1" and "2"?
Without " " as delimiters, Stata trims internal spaces to single
spaces in local macro definition. The " " insist on taking things
quite literally.
Try
local foo a b c
and see what happens.
So, -strpos()- can't find a double space as there isn't one.
I don't think looping is germane here.
Nick
[email protected]
On 20 August 2013 19:52, Matthew White <[email protected]> wrote:
> Hi all,
>
> Using Stata 13 for Windows 7, I'm trying to figure out an interaction
> between -local- and loops. Normally when I define a local, multiple,
> consecutive internal spaces are preserved. For example:
>
> . local x 1 2
>
> . display strpos("`x'", " ")
> 2
>
> Yet when I use the same definition in a loop, the internal spaces are trimmed:
>
> . forvalues i = 1/5 {
> 2. local x 1 2
> 3. }
>
> . display strpos("`x'", " ")
> 0
>
> Have others experienced this before? It's probably rare that this
> would bite, but I'm running into such a situation now. Enclosing the
> contents of the local by double quotes solves the problem:
>
> . forvalues i = 1/5 {
> 2. local x "1 2"
> 3. }
>
> . display strpos("`x'", " ")
> 2
>
> I'm just so used to dropping these quotes when I don't need them!
>
> Thank you,
> Matt
>
> --
> Matthew White
> Senior Project Associate
> Innovations for Poverty Action
> 101 Whitney Avenue, New Haven, CT 06510 USA
> www.poverty-action.org
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