Very impressive, [EMAIL PROTECTED] appears distorted in the archives by the 
way. 

To: "Programming forum" <[email protected]>
leaner, faster

involute=.$ /:@(+/\)@(,@(<./ {. |:@(1 0 + [EMAIL PROTECTED]@|.)) # +:@<./ $ (, 
-)@(1 ,
{:))
vs
   spiral=. $ /:@:(*/ {. }:@:(0&({::)@:((([ , {.@:]) ;
|.@:|:@:}.@:])&>/^:_))@:(''&;)@:i.)

  (spiral-:involute) 200 300
1
 st=.7!:[EMAIL PROTECTED] , 6!:2

   st 'spiral 200 300'
5.24621e6 0.389979
   st 'involute 200 300'
1.0496e6 0.00278834

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