Here's a little demo to show you that there are really two circles in the
final plot.
The second plot erases the previous plot, so look at the code line by line.
load 'plot'
do=: 13 :'({.y)+(i.{:>:y)*(--/}:y)%{:y'
t=:do 0,(o.4),1000
sin=:1&o.
plot t;z
cos=:2&o.
plot sin t
plot cos t
'pensize 2;aspect 1'plot t;(sin t);cos t
'pensize 2;aspect 1'plot (sin t);cos t
Time is of the essence. Linda
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