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Re: st: RE: Left quoting


From   "Clive Nicholas" <Clive.Nicholas@newcastle.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Left quoting
Date   Fri, 5 Dec 2003 14:49:08 -0000 (GMT)

Nick,

OK, cool. Thanks for the swift explanation on this to a non-programmer.

C.

> No. That is how the Stata language is,
> and there is at least one very good reason for it.
>
> Stata allows references to nested macros, and
> they are extremely useful. If you look at most
> substantial programs, you will see stuff like
> ``i'' and `a`i''. (Wrapping your head around
> this is a crucial step in learning Stata programming,
> but worth the effort.)
>
> Given that fact, there would be a problem
> if there no distinction between the start
> of a local macro reference and the end of
> one, as expressions like
>
> 'a'i'j'
>
> would be ambiguous: is this
>
> 1. the local macro 'a'
>    followed by the character "i"
>    followed by the local macro 'j'
>
> or
>
> 2. the local macro 'i'
>    nested within another local
>    macro whose name starts
>    with "a" and whose name
>    ends with "j"
>
> ?
>
> The interpretation could be very
> different. `a'i`j' and `a`i'j'
> remove the ambiguity.
>
> In addition, the stylistic affront
> is dependent on what font you use.
> I happen to be writing this font
> in a font in which the left quote
> slopes and the right font is vertical
> -- and, dependent on your set-up,
> you reading this may see something
> similar -- and I agree that is ugly.
> The remedy is to change the font,
> and in particular Stata's own fonts
> preserve the leftness of left quotes
> and the rightness of right quotes,
> so all gaucheness or sinister behaviour
> is matched by its mirror image.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Clive Nicholas
>
>> Could you use (') instead of (`)? It looks nicer stylistically.
>
>> Nick Cox wrote:
>>
>> [...]
>>
>> > `=   that is left quote followed by =
>> >
>> > means "evaluate what follows between here and the matching right
>> > quote".
>
> *
> *   For searches and help try:
> *   http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>


Yours,
CLIVE NICHOLAS,
Politics Building,
School of Geography, Politics and Sociology,
University of Newcastle-upon-Tyne,
Newcastle-upon-Tyne,
NE1 7RU,
United Kingdom.
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



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