Re: st: AW: compare files, vars only

["Martin Weiss" <martin.weiss1@gmx.de>]

<>

Wow, this thing lingers on, but I think we have seen this variation 
before...
http://www.stata.com/statalist/archive/2009-02/msg00826.html


HTH
Martin
_______________________
----- Original Message ----- 
From: "Jeph Herrin" <jeph.herrin@yale.edu>
To: <statalist@hsphsun2.harvard.edu>
Sent: Thursday, February 19, 2009 5:34 PM
Subject: Re: st: AW: compare files, vars only


> I think
>
>  loc diff : list first - second
>
> will only give the variables in the first file not in the
> second, but ignores those in the second not in the first.
>
> how about:
>
> ************* compare variables ********
> program define compvars
> syntax using/
> tempname file1 file2 equiv diff1 diff2
> quietly d , varlist
> local `file1'=r(varlist)
> quietly d using `using', varlist
> local `file2'=r(varlist)
> local `equiv' : list `file1'===`file2'
> if ``equiv''!=1 {
> local `diff1' : list `file1'-`file2'
> local `diff2' : list `file2'-`file1'
> di "Difference: "
> di "   In master not using:  "
> di "                ``diff1''"
> di "   In using not master:  "
> di "                ``diff2''"
> }
> else {
> di "Difference: "
> di "   None!    "
> }
> end
> ****************************************************
>
> Whence:
>
> . sysuse auto
> . drop  gear_ratio displacement
> . save newauto,replace
> . sysuse auto
> . compvars using newauto
> Difference:
>    In master not using:
>                 displacement gear_ratio
>    In using not master:
>
>
> hth,
> Jeph
>
>
>
> Johannes Geyer wrote:
> > what about:
> >
> >  *************
> >  clear*
> >  sysuse auto, clear
> >  drop  gear_ratio displacement
> >  save newauto, replace
> >  sysuse auto, clear
> >  qui ds
> >  loc first `r(varlist)'
> >
> >  des using auto, varlist
> >
> >  loc second `r(varlist)'
> >  loc diff: list first - second
> >  di in red "Differences: `diff'"
> >  *************
> >
> > -describe- does not need to load the dataset which may be of interest 
> > here
> >
> >
> > Johannes
> >
> > owner-statalist@hsphsun2.harvard.edu schrieb am 19/02/2009 16:53:44:
> >
> > > <>
> > >
> > >
> > >
> > > *************
> > > clear*
> > > sysuse auto, clear
> > > drop  gear_ratio displacement
> > > save newauto, replace
> > > sysuse auto, clear
> > > qui ds
> > > loc first `r(varlist)'
> > > u newauto, clear
> > > qui ds
> > > loc second `r(varlist)'
> > > loc diff: list first - second
> > > di in red "Differences: `diff'"
> > > *************
> > >
> > > I am sure I have violated several rules on the possible lengths of
> > > components in here (think 244...)
> > >
> > >
> > > HTH
> > > Martin
> > >
> > >
> > > -----Ursprüngliche Nachricht-----
> > > Von: owner-statalist@hsphsun2.harvard.edu
> > > [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von David
> > Kantor
> > > Gesendet: Donnerstag, 19. Februar 2009 16:41
> > > An: Statalist
> > > Betreff: st: compare files, vars only
> > >
> > > Hi.
> > > Does anyone know of a program to compare the sets of variables in two
> > > data files? What I have in mind is something akin to -cf-, but...
> > >   it would not compare values -- only the names of variables;
> > >   it would not care whether the two data files had the same number of
> > > observations.
> > >
> > > I was planning to write such a program, but I wanted to be sure that
> > > it hadn't already been done.
> > > Thanks
> > > --David
> > >
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