error: expected floating-point number but got

From: Shen, Han (han.shen_at_bme.gatech.edu)
Date: Thu Aug 04 2011 - 10:21:32 CDT

Hi,

I tried to do some simple calculation then draw something in a certain pattern. So I use:
graphics top sphere {$x2 $y2 $z2} radius 0.2 resolution 100

But error shows:
expected floating-point number but got "$x"

Anyone can tell me how to deal with it? Thanks in advance!

-- 
Han Shen
Wallace H. Coulter Department of Biomedical Engineering
Georgia Institute of Technology and Emory University

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