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From: Tobias Burnus <tobias.burnus@physik.fu-berlin.de>
Newsgroups: gmane.comp.tex.context
Subject: Metapost question
Date: Tue, 14 Jun 2005 08:54:22 +0200
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Hello,

does someone know how, if at all, one can printout some variable? Like
  Emean:=(2*Eone+Ezero+2*Etwo)/5.;
  label.urt(btex $A = x$ ....
where x is the value of Emean? I frequently create some diagrams, modify 
them and then forget to change the label. (If one could set the number 
of digits, it would be even nicer.)

Tobias