Re: st: RE: RE: RE: macro list limits strpos

[Jakob Petersen <jpeterb@essex.ac.uk>]

The extended macro function `: list ...' did the trick. Thanks a lot.  Jakob

On 20/01/2012 13:26, Nick Cox wrote:
> Conversely, this example shows another use of -findname- (SJ):
>
> . sysuse auto, clear
> (1978 Automobile Data)
>
> . findname , type(int string) not
> headroom    gear_ratio  foreign
>
> That is, the last line shows variables which are not _either_ int _or_ string (or neither int not string).
>
> The equivalent with -ds- (official Stata) is
>
> . ds , not(type int string)
> headroom    gear_ratio  foreign
>
> but -ds- does not support a -local()- option; you'd need to pick its up results from `r(varlist)'.
>
> Nick
> n.j.cox@durham.ac.uk
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: 20 January 2012 11:23
> To: 'statalist@hsphsun2.harvard.edu'
> Subject: st: RE: RE: macro list limits strpos
>
> Also, -findname- is unnecessary for the latter part of the code. You could just loop over the variables, look up the -type- of each and display messages accordingly. No string processing is needed.
>
> Nick
> n.j.cox@durham.ac.uk
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: 20 January 2012 10:58
> To: 'statalist@hsphsun2.harvard.edu'
> Subject: st: RE: macro list limits strpos
>
> -findname- (SJ ) is a user-written program. Please remember....
>
> Your difficulty is that -strpos()- won't find items beyond a certain position in a string because of limits on the length of string it handles. This difficulty is explained in the 2008 posting you cite and is nothing whatsoever to do with memory or maxvar settings. The maximum is 244 in all flavours of Stata (12) and is not tunable.
>
> Try this:
>
> sysuse auto,clear
> findname,type(string) local(vstr)
> findname,type(int) local(vint)
>
> foreach v of varlist * {
> if `: list v in vstr' {
> di "`v' is a string variable"
> }
> if `: list v in vint' {
> di "`v' is an integer variable"
> }
> if `: list v in vother' {
> di "`v' is not string nor integer variable"
> }
> }
>
> In fact, notice that your logic can be simplified to
>
> sysuse auto,clear
>
> findname,type(string) local(vstr)
> findname,type(int) local(vint)
>
> foreach v of varlist * {
>
> 	if `: list v in vstr' {
> 		di "`v' is a string variable"
> 	}
> 	else if `: list v in vint' {
> 		di "`v' is an integer variable"
> 	}
> 	else "`v' is not string nor integer variable"
>
> }
>
> Nick
> n.j.cox@durham.ac.uk
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Jakob Petersen
> Sent: 20 January 2012 10:30
> To: statalist@hsphsun2.harvard.edu
> Subject: st: macro list limits strpos
>
> Statalist,
>
> Problem: The following does not scale up to longer macro lists and
> variables at the end of longer macros are cut off.
>
> ***************************************************
> sysuse auto,clear
> findname,type(string) local(vstr)
> findname,type(int) local(vint)
> findname,local(vother)
> local vother : list vother - vstr
> local vother : list vother - vint
> di "`vstr'"
> di "`vint'"
> di "`vother'"
> foreach v of varlist * {
> if strpos("`vstr'","`v'") {
> di "`v' is a string variable"
> }
> if strpos("`vint'","`v'") {
> di "`v' is an integer variable"
> }
> if strpos("`vother'","`v'") {
> di "`v' is not string nor integer variable"
> }
> }
> ***************************************************
>
> Any ideas?
> Similar to: http://www.stata.com/statalist/archive/2008-01/msg00945.html
>
> Tried increasing maxvar to no avail - is there away of increasing mem
> allocation here or is a different approach to -strpos- required?
>
> Thanks,
> Jakob Petersen
>
> *
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--

Kind regards,
Jakob


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