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st: RE: Adding variables with common prefix


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Adding variables with common prefix
Date   Tue, 30 May 2006 14:17:28 +0200

Rafa:
It should be:
local sum = 0
foreach v of varlist var* {
    local sum = `sum' + `v'[1]
}
scalar answer = `sum'

It could also be achieved through -egen rtotal = rowtotal(var*)-

HTH,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z214 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of R.E. De Hoyos
Sent: dinsdag 30 mei 2006 14:10
To: statalist@hsphsun2.harvard.edu
Subject: st: Adding variables with common prefix


I have a large list of variables with a common prefix, say -var- (var1,
var2, var3...). I want to generate a scalar with the sum of these variable's
first observation. I tried the following loop, but for some reason that I
can't see it is not working, it returns an invalid syntax error message:

local sum = 0
foreach v of var* {
    local sum = `sum' + `v'[1]
}
scalar answer = `sum'

What is wrong with this code? Is there an alternative way of adding up
variables with a common prefix?

Rafa
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