[amibroker] RSI of ROC

[bartvandyk]

I would like to plot the RSI of ROC. I copied the following formula
from the library:

To find the 14-day RSI of Stochd(14):
/*14-Day RSI of StochD(14)*/
t=14;
Var=Stochd(14);
Up=IIf(Var>Ref(Var,-1),abs(Var-Ref(Var,-1)),0);
Dn=IIf(Var<Ref(Var,-1),abs(Var-Ref(Var,-1)),0);
Ut=Wilders(Up,t);
Dt=Wilders(Dn,t);
RSIt=100*(Ut/(Ut+Dt));
Graph0=RSIt;
An interesting application is in
http://groups.yahoo.com/group/amibroker/message/7628
where the 14-day RSI of MACD() is introduced. 

I substituted Stochd(14) for ROC(14), but the resulting graph is blanc

Does anyone have time to shine a light on that?

Thanks.