Ehlers RSI smoothed: help needed...

["gillesdeprez" <gillesdeprez@xxxx>]

Hi, group!
Well, the master degree in computer science is still far away :(
Here is the translation I made from this indicator formula found in 
october TASC issue:
period=10;
smooth23=(C+(2*Ref(C,-1))+(2*Ref(C,-2))+Ref(C,-3))/6;
change=ROC(smooth23,1);
Cu23=Sum(IIf(Change>0,Change,0),period);
Cd23=Sum(IIf(Change<0,abs(Change),0),period);
ehlers=Cu23/Cu23+Cd23;
Plot(ehlers,"Ehlers smoothed RSI",11,4);

BUT:
The curve peaks when it should bottom...
The scale goes sometimes from 0 to 12, sometimes from 0 to 
42...instead of being 0 to 1!Ok, from a mathematical point of view, 
this makes sense, but I don't see anything in the Metastock formula 
to solve that issue...Did one of you translated the formula 
successfully? I didn't find it in the library, or on the forum;
Thanks !
Gilles