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?
Cheers,
Mark
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