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st: Making a local with no assigned value zero

From   George Chioran <>
Subject   st: Making a local with no assigned value zero
Date   Mon, 14 Jun 2010 13:02:26 -0700 (PDT)

Dear statalisters, 
My code goes like
this: local x1 = `x1’ + `y1’. I get the `y1’ variable through repeated loops
and sometimes `y1’ is not assigned any value. 
When `y1’ does not
have any value, the line local x1 = `x1’ + `y1’ stops my program and I get an invalid
syntax error. 
My question is: Could
I somehow make the local `y1’ to be equal to zero, or not to be taken into
consideration in my sum in case `y1’ is not assigned any value? 
Thank you, 


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