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Dirichlet function plot

• To: mathgroup at smc.vnet.net
• Subject: [mg23552] Dirichlet function plot
• From: David Ong <do226 at is2.nyu.edu>
• Date: Sat, 20 May 2000 03:10:28 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi, 

Would anyone know of an easy way to plot some approximation of this
variant of the Dirichlet function? 
f(x)=1/x if x is an element of the rationals and 0 if x is not an element
of the rationals.