A detail worth emphasising is that the original
code used a scalar only at the very last step.
This cannot of course reclaim any precision lost
by using locals previously. Often this won't
matter in practice, but not always.
Nick
[email protected]
n j cox
> 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]
> }
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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