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st: missing values

Subject   st: missing values
Date   Wed, 21 Sep 2005 21:11:46 -0700

Hi, is it normal to have a problem with recoding things to missing values based on some sort of boolean condition. I checked the condition several times, and when I write: "gen extra=0 if(condition)" then this gives me the correct values. If, however, I write: "replace mainvar=. if (condition)" then this does not work. The problem was solved by doing "replace mainvar=.a" this seems strange to me and I'm not sure why it's happening. any suggestions?
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