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Re: st: Adding variables with common prefix


From   n j cox <n.j.cox@durham.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Adding variables with common prefix
Date   Tue, 30 May 2006 13:26:51 +0100

Look again at the help for -foreach-.

foreach v of var var* {

That is, you must specify that var* is a varlist.

I would also use a scalar here.

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

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

R.E. De Hoyos

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?
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