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st: graph combine and a graph named n

From   "German Rodriguez" <grodri@Princeton.EDU>
To   <>
Subject   st: graph combine and a graph named n
Date   Wed, 4 Oct 2006 21:48:46 -0400

This curious result, where graph combine doesn't recognize a memory graph
named n, came up in some work and is easily reproduced

sysuse lifeexp
scatter lexp gnppc, name(a)
scatter lexp gnppc, xscale(log) name(n)
graph combine a n 

Stata will complain that "n is not a memory graph". This also happens if you
try -graph combine n a-
However, -graph display n- works fine, showing that the graph exists, and
-graph describe n- gives all the details, starting with "n stored in
The problem happens only if the graph is called n; you can substitute any
single-letter name other than n in the fragment above, for example the more
logical b, and it will work fine. 

Obviously graph combine doesn't like graphs named n. What am I missing? 

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