Re: AW: st: Creating local from levelsof exceeding 255 characters

[Roger Newson <r.newson@imperial.ac.uk>]

I personally usually use Mata in cases similar to this. See the on-line 
help under

help mf_st_local

for more on the -st_local()- function (which moves values between Local 
macros and string scalars), and under

help mf_st_global

for more on the -st_global()- function (which moves values between -r()- 
results and string scalars), and under

help mf_tokens

for more on the -tokens()- function (which converts a string list to a 
string vector), and

help mf_invtokens

for more on the -invtokens()- function (which converts a string vector 
to a string list).

I hope this helps.

Best wishes

Roger


Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
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London SW3 6LR
UNITED KINGDOM
Tel: +44 (0)20 7352 8121 ext 3381
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Email: r.newson@imperial.ac.uk
Web page: http://www.imperial.ac.uk/nhli/r.newson/
Departmental Web page:
http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/

Opinions expressed are those of the author, not of the institution.

On 14/01/2011 14:22, Maarten buis wrote:
> --- On Fri, 14/1/11, Palan, Stefan wrote:
> > What I do is, I fill my local "a" with the levelsof some
> > variable. The local a then contains some 100 numbers. But
> > then, I need to create a local that contains a string that
> > looks like "t1 t2 t4 t7...". In other words, it needs to
> > contain an entry for each number in a, but with a leading
> > "t", because my variable names are t1, t2, etc.
>
> One way to do this is to:
> 1) make sure that each element in your list is separated by
> one space (extended macro function -list retokenize-)
>
> 2) replace each " " with " t" (extended macro function
> -subinstr-)
>
> 3) this only leaves the first element without a t prefix, so
> add that initial t.
>
> Putting this all together:
>
> *--------------- begin example -------------------
> // create a variable such that a string listing
> // all its values is longer than 245 characters
> drop _all
> set obs 500
> gen id = _n
>
> // store that string in locals
> levelsof id, local(levs)
>
> // makes sure that elements separated by one space
> // this is probably superfluous since this is created
> // by -levelsof-, but it does not hurt.
> local levs : list retokenize levs
>
> // replace space with space and "t"
> local levs : subinstr local levs " " " t", all
>
> // add the initial "t"
> local levs "t`levs'"
>
> // do the loop
> foreach lev of local levs {
>      di "`lev' "
> }
> *--------------- end example ----------------------
> (For more on examples I sent to the Statalist see:
> http://www.maartenbuis.nl/example_faq )
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
> http://www.maartenbuis.nl
> --------------------------
>
>
>
>
>
>
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