Well, I found something more relevant for the formula :
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CurrentATR=[(PriorATRx13)+CurrentTR]/14
-Multiplytheprevious14-dayATRby13.
-Addthemostrecentday'sTRvalue.
-Dividethetotalby14
So here is the ATR formula to compute the Daily timeframe to be used in any other timeframe.
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period=14
//True range calculation
d1=Dhigh(0)-Dlow(0)
d2=abs(Dhigh(0)-Dclose(1))
d3=abs(Dlow(0)-Dclose(1))
dailyTR=max(d1,max(d2,d3))
c=exponentialaverage[period](dailyTR)
RETURNcas"Daily Timeframe ATR"
Which return the good result in daily timeframe, same as the embedded ATR of the platform (look at picture attached). But a slightly different one when in inferior timeframe. Don’t know really why for the moment..