> for(x=x1;x <= x2;x++)
> {
>   <take an a step>
>   if(eps >= 0)
>   {
>     <take an b step>
>     eps -= DeltaX;
>   }
> }

I didn't look thru how you got here, but EPS needs to be adjusted each
iteration, else you will never stop taking just A steps once you start.
Also, the point is to take an A *or* B step each iteration.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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