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I am trying to build a custom indicator for Heikin Ashi. I was able to enter the equation for the first 2 lines but I do not know how to enter the equation for the 3rd and 4th lines. The formula is as follows

1-Open = (open of previous bar+close of previous bar)/2
2-Close = (open+high+low+close)/4
3-High = maximum of high, open, or close (whichever is highest)
4-Low = minimum of low, open, or close (whichever is lowest)

My other quetions are
1- Is their a way to give title to each indicator line.
2- In the right lower corner of Trading Block Editor their are 2 red tabs one for indicators and the other for advanced. How can we learn more about these 2 tabs???

Thanks for your assistance.

Try using MathMax in the formula (click on advanced to write the formula), something like this :
MathMax(MathMax(Open[i],High[i]),Close[i]);
Note that MathMax was designed to compare 2 values, the line above compares 3 values

double MathMax( double value1, double value2)
Returns the maximum value of two numeric values.
Parameters:
value1 - The first numeric value.
value2 - The second numeric value.

Sample:
double result=MathMax(1.08,Bid);


Try using MathMin


To show it in mt4 ? it is not possible



Have you seen the manuals? http://www.molanis.com/support/manuals
With advanced you write your own formula. Gives more control since you do not have to use the buttons.
The other option is to use indicators in your calculations., to create logics like 5*moving average indicator a/2.

Thanks a lot for such a detailed answer. It helped me a lot. Great support.

I tried the MathMax equation for item#3 but got the error message stating ERROR:You equation has errors.
Please help

Make sure you use
MathMax(MathMax(Open[i],High[i]),Close[i])
without the ;