...searching the RAA came up with ruby-gdchart:

http://raa.ruby-lang.org/list.rhtml?name=ruby-gdchart

Is this what folks are using?  I'm just looking to make some fairly
simple line charts to illustrate the effects of fuzzy logic membership
functions:

http://ai-app-prog.rubyforge.org/

Thanks,

tom
-- 
Tom Copeland <tom / infoether.com>
InfoEther