You might be able to use the extended macro function -subinstr- and -
unab-
For example:
clear
set obs 100
set seed 1234
forv i = 1/10 {
qui gen x`i' = uniform()
qui replace x`i' = . if uniform()<.2
}
unab a: x*
local b: subinstr local a " " " != . & ", all
disp "`b'"
l x* if `b' != .
Scott
----- Original Message -----
From: "Joel J. Adamson" <[email protected]>
Date: Wednesday, January 17, 2007 2:08 pm
Subject: st: Map logical operator across varlist?
To: [email protected]
> Does anyone know how to map a logical operation (e.g., | or &) across
> a list so that I can save myself some typing?
>
> Let me give you an example (the one that prompted the search for an
> answer):
>
> I want to list a set of variables, only if an observation is not
> missingfor the variables in question. We usually handle this by
> constructinga small logical expression:
>
> l med1 med2 if (med1~=.|med2~=.)
>
> However, if I have six, or a hundred "med" variables (med*), it would
> be easier (less error-prone) to type:
>
> l med* if |(med*~=.)
>
> Where the "|" before the "(" maps the operation onto the expanded
list
> of variables.
>
*
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