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st: RE: temporary variables (was: xpose or reshape)


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: temporary variables (was: xpose or reshape)
Date   Tue, 12 Oct 2004 19:29:06 +0100

No, the -set- statement is just fantasy syntax. 

There was code in my program to get the names 
out of the first row. I'd start from that. 
See code for the -firstnames- option. 

Nick 
n.j.cox@durham.ac.uk 

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of 
> Wallace, John
> Sent: 12 October 2004 18:48
> To: statalist@hsphsun2.harvard.edu
> Subject: st: temporary variables (was: xpose or reshape)
> 
> 
> The final step in my original transposition problem was to get the
> variable names out of the first row of observations (see end of
> message).  I've accomplished this with the following do-file 
> code, but I
> suspect it could be tightened up some, particularly with regard to the
> way I'm handling a temporary variable.
> 
> ----------begin good code--------------
> qui d
> local no_vars = r(k)
> forval i=1/`no_vars'{
> 	local tvarname: di _var`i'[1]
> 	gen tvar = "`tvarname'"
> 	qui replace tvar = lower(tvar)
> 	qui replace tvar = subinstr(tvar," ","",.)
> 	qui replace tvar = subinstr(tvar,"#","no_",.)
> 	qui replace tvar = subinstr(tvar,"%","pct_",.)
> 	qui replace tvar = subinstr(tvar,"(","_",.)
> 	qui replace tvar = subinstr(tvar,")","",.)
> 	local tvarname: di tvar[1]
> 	qui drop tvar
> 	capture rename _var`i' `tvarname'
> }
> drop in 1
> ---------end good code-----------------
> 
> Rather than using -gen tvar- I thought I should be able to use
> . tempvar tvar
> . set `tvar'[1] = "'tvarname'"
> . qui replace `tvar' = lower(`tvar') 
> etc
> 
> but I get errors when I try this: -set __000000- not allowed; 
> '__000000'
> not recognized
> 
> -JW
> 
> -----Original Message-----
> From: Nick Cox [mailto:n.j.cox@durham.ac.uk] 
> Sent: Tuesday, October 12, 2004 5:08 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: RE: xpose or reshape
> 
> A step or two more general. I'll post on SSC. 
> 
> *! NJC 1.0.0 12 Oct 2004 
> program sxpose 
> 	version 8 
> 	syntax , clear [ firstnames destring ] 
> 
> (code snipped for brevity)
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> > -----Original Message-----
> 
> Wallace, John
> (snipped)
> It looks like a clear case for -xpose-, except that all the data are
> brought into Stata as strings because the first row (filenames) are
> strings.  -xpose- results in an empty dataset.  I'm looking at reshape
> and stack, but I can't figure out how they could accomplish what I'm
> looking for:
> 
> 	v1	v2		v3		v4		v5
> v6	v7	v8
> 1	v1	.		Date		type		group
> noise	bkd	bkdsd
> 2	v2	foo1.chp	10/11/2004	U133A_2	lymph	1.4
> 46.7	0.28
> 3	v3	foo2.chp	10/11/2004	U133A_2	lymph	1.24
> 50.4	0.28
> 4	v4	foo3.chp	10/11/2004	U133A_2	lymph	1.5
> 32.4	0.26
> 5	v5	foo4.chp	10/11/2004	U133A_2	heart	1.25
> 18.6	0.09
> 
> (or actually, ideally)
> 
> 	v1		Date		type		group	noise
> bkd	bkdsd
> 1	foo1.chp	10/11/2004	U133A_2	lymph	1.4	46.7
> 0.28
> 2	foo2.chp	10/11/2004	U133A_2	lymph	1.24	50.4
> 0.28
> 3	foo3.chp	10/11/2004	U133A_2	lymph	1.5	32.4
> 0.26
> 4	foo4.chp	10/11/2004	U133A_2	heart	1.25	18.6
> 0.09
> 
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