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st: RE: Making a local with no assigned value zero

From   "Nick Cox" <>
To   <>
Subject   st: RE: Making a local with no assigned value zero
Date   Mon, 14 Jun 2010 21:08:38 +0100

There are various fixes. Here are some: 


if "`y1'" == "" local y1 = 0 
local x1 = `x1' + `y1' 


local x1 = cond("`y1'" != "", `x1' + `y1', `x1') 


if "`y1'" != "" local x1 = `x1' + `y1' 


George Chioran
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? 

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