Nick Cox writes:
> I had this hypothesis too. However, -twoway line-
> does not appear to be an r class command, so
> where the results getting overwritten?
A simple example:
.. sysuse auto
(1978 Automobile Data)
.. tab foreign
Car type | Freq. Percent Cum.
------------+-----------------------------------
Domestic | 52 70.27 70.27
Foreign | 22 29.73 100.00
------------+-----------------------------------
Total | 74 100.00
.. return list
scalars:
r(N) = 74
r(r) = 2
.. twoway line price mpg
(graph gets drawn -- not shown)
.. return list
..
I don't know who overwrote them, but they are gone!
Tom
> Steichen, Thomas J.
>
> > Jorge Morgenstern writes (in part):
> >
> > > I want a graph for each category (each country) in my
> > > dataset. I then generate the variable series and loop
> > > up to its maximum. What's really odd it's that, if I
> > > disable the twoway command, the list of countries
> > > displays correctly. If I enable it, only the first
> > > country is displayed, and only the first graph shows
> > > the title. The rest of the iterations generate an empty
> > > display line and an empty titled graph.
> > >
> > > egen series=group(country_codeifs)
> > > quietly tab series
> > > local cant=r(r)
> > > forval x=1/`cant' {
> > > local c= trim(country_name[r(N)/r(r)*`x']) *****this
> > > inputs the first
> > > record of each category to the title variable
> > > noi di " `c' "
> > > twoway (line exp_lblended mktdate if series==`x') ,
> > title(" `c' ")
> > > }
> >
> > The problem likely is that returned values r(N) and r(r) no longer
> > exist after -twoway- runs (they came from the -tab- outside of the
> > loop). Try saving them as macros before the loop then use
> > the macros.
>
> *
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> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
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