How do I use Renko in an indicator?  How can I "call" this function ?  I'd like to create an expert advisor based on it but I can not do it.

Unfortunately, as this is a price style, there is no way to use it as a function. This is similar to 3 Line Break, Kagi and P&F. It would take a DLL to do this, similar to what was done with P&F, by Equis.

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Trader Joe

a formula called renko binary wave

 

K:=1.896;
RenkoLine:=If(Cum(1)=1,CLOSE,
If(PREV>=0,
If(CLOSE<PREV-2*K,-(PREV-2*K),
Floor(Max(C-PREV,0)/K)*K+PREV),
If(CLOSE>Abs(PREV)+2*K,-PREV+2*K,
Floor(Max(Abs(PREV)-C,0)/K)*K+PREV)));
RL:=Abs(RenkoLine);
RL;

BW:=If(Cum(1)=1,0,
If(RL>Ref(RL,-1),+1,If(RL<Ref(RL,-1),-1,PREV)));
BW;0;