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Re: st: RE: Funny macro behaviour inside a programme
Quoting Nick Cox <firstname.lastname@example.org>:
> 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 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?
> * 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/
Prof. Mark Schaffer
Department of Economics
School of Management & Languages
Heriot-Watt University, Edinburgh EH14 4AS
tel +44-131-451-3494 / fax +44-131-451-3008
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