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Re: st: RE: Funny macro behaviour inside a programme


From   Mark Schaffer <M.E.Schaffer@hw.ac.uk>
To   statalist@hsphsun2.harvard.edu, Nick Cox <n.j.cox@durham.ac.uk>
Subject   Re: st: RE: Funny macro behaviour inside a programme
Date   Fri, 05 Nov 2004 09:09:31 +0000 (GMT)

Nick,

Quoting Nick Cox <n.j.cox@durham.ac.uk>:

> There was a while back a limit of 7 on the number of 
> characters in a local macro name. Perhaps some earlier statement 
> in your code is setting the -version- back 
> so that limit bites. 

That's it!  Thanks.

--Mark

> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> Mark Schaffer
>  
> > Hi everybody.  I've run into some funny behaviour by Stata 
> > when dealing 
> > with macros inside a programme.
> > 
> > Here's a snippet of a -trace-.  The programme calls -test-, 
> > then displays 
> > the results, then uses -tempname- to allocate some more local 
> > names for 
> > scalars.  It assigns a value to the new local `hpvalue', 
> > which has been 
> > given the local variable __00000O.  Not shown are two earlier 
> > lines that 
> > assigns values to previously-defined locals `hpvalue1' and 
> > `hpvalue2'.  
> > The last command asks Stata (8.2, btw) to display the values 
> > of both of 
> > these locals.
> > 
> > scalars:
> >               r(drop) =  0
> >               r(chi2) =  7.778333995775768
> >                 r(df) =  1
> >                  r(p) =  .0052876538356317
> >   - tempname htest hpvalue hdf hsigma
> >   - scalar `htest'=r(chi2)
> >   = scalar __00000N=r(chi2)
> >   - scalar `hpvalue'=r(p)
> >   = scalar __00000O=r(p)
> >   - di "hpvalue1=" `hpvalue' "  hpvalue2=" `hpvalue2'
> >   = di "hpvalue1=" __00000O "  hpvalue2=" __00000O
> > hpvalue1=.00528765  hpvalue2=.00528765
> > 
> > What is curious is that both `hpvalue1' and `hpvalue2' are 
> > expanded to the 
> > local variable that was assigned to `hpvalue', namely __00000O.
> > 
> > Eventually I got rid of the bug by using shorter local macro 
> > names.  But 
> > `hpvalue1', for example, has only 8 characters. Did I miss a 
> > bit in the 
> > manual that says that local macros have to have names with 
> > fewer than 8 (!) characters?
> 
> *
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> 



Prof. Mark Schaffer
Director, CERT
Department of Economics
School of Management & Languages
Heriot-Watt University, Edinburgh EH14 4AS
tel +44-131-451-3494 / fax +44-131-451-3008
email: m.e.schaffer@hw.ac.uk
web: http://www.sml.hw.ac.uk/ecomes
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