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


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: RE: macro list limits strpos
Date   Fri, 20 Jan 2012 13:26:27 +0000

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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