This custom RSI will allow you to select which price data to use when you plot it. The standard RSI uses the close value as Welles Wilder did when he created the indicator. This custom indicator will allow you to use the other price fields including volume. Q:=Input("Time Periods",1,1000,14); B:=Input("Field: 1=Close, 2=Open, 3=High, 4=Low, 5=Volume",1,5,1); Z:=If(B=1,Wilders(If(ROC(C,1,$)>0,ROC(C,1,$),0),LastValue(Q)),If(B=2,Wilders(If(ROC(O,1,$)>0,ROC(O,1,$),0),LastValue(Q)),If(B=3,Wilders(If(ROC(H,1,$)>0,ROC(H,1,$),0),LastValue(Q)),If(B=4,Wilders(If(ROC(L,1,$)>0,ROC(L,1,$),0),LastValue(Q)),Wilders(If(ROC(V,1,$)>0,ROC(V,1,$),0),LastValue(Q)))))); Y:=If(B=1,Wilders(If(ROC(C,1,$)<0,Abs(ROC(C,1,$)),0),LastValue(Q)),If(B=2,Wilders(If(ROC(O,1,$)<0,Abs(ROC(O,1,$)),0),LastValue(Q)),If(B=3,Wilders(If(ROC(H,1,$)<0,Abs(ROC(H,1,$)),0),LastValue(Q)),If(B=4,Wilders(If(ROC(L,1,$)<0,Abs(ROC(L,1,$)),0),LastValue(Q)),Wilders(If(ROC(V,1,$)<0,Abs(ROC(V,1,$)),0),LastValue(Q)))))); RS:=Z/Y; 100-(100/(1+RS))

I can't quite see why either formula needs to use LastValue(). The value from the Input() function is already a constant. Roy

My formula was simply a version of Patrick's, so it was all his fault! :lol: Seriously, the only reason would be if the input was originally used with a variable input or maybe that was the original authors way of overcoming the notorius division fault inherent with the RSI. Roy is right though and a simple Q is all that is needed. So the formula that I posted becomes: Q:=Input("Time Periods",1,1000,14); B:=Input("1=Close,2=Open,3=High,4=Low,5=Vol,6=Typ,7=Med",1,7,1); B:=If(B=1,C,If(B=2,O,If(B=3,H,If(B=4,L,If(B=5,V,If(B=6,Typical(),MP())))))); Z:=Wilders(If(ROC(B,1,$)>0,ROC(B,1,$),0),Q); Y:=Wilders(If(ROC(B,1,$)<0,Abs(ROC(B,1,$)),0),Q); RS:=Z/Y; 100-(100/(1+RS)) {end} Preston

Here we go let's blame it on the French again :roll: :D I have the same ability, you should be proud of it :oops: :lol: Patrick :mrgreen: