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st: distance data missing values

From   Ermal Hitaj <>
Subject   st: distance data missing values
Date   Thu, 16 Oct 2008 13:28:32 -0700 (PDT)


I wonder whether somebody could help with the following:
I have trade distance data in a long form. I have missing values as follows.

Exporter Importer Distance
A          B       1000km
B          A          .

I need to substitute the missing values with the distance value from the case where country A is the exporter and B is the importer.
Obviosly, there's a lot of countries (and a lot of products).


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