void smithcir (u, v, radius) SMITH.C Level 3
 
float u  The horizontal position of the center of the circle.
float v  The vertical position of the center of the circle.
float radius The radius of the circle.
 
smithcir() draws a circle on a Smith chart. The coordinate system is Cartesian with u = 0, v = 0 at the center of the 
chart and with the maximum radius normalized to 1.0.