“initial” devait être une variable externe à renseigner avec une valeur quelconque, je lui ai ici affecté la valeur 0.02.

J’ai revu un peu le code et ça fonctionne désormais, voici le code corrigé ci-dessous et un exemple du rendu à l’écran. Cela ressemble à ce que tu souhaitais obtenir ?

once islong = 1
once reverse = 0
once af = 0.02//initial
once highvalue = high
once lowvalue = low

once prevhighvalue = high
once prevlowvalue = low
once mysar = lowvalue

if barindex>10 then 
highvalue = max(highvalue, high[1])
lowvalue = min(lowvalue, low[1])

if islong then
if low[1] < mysar then 
reverse = 1 
islong = 0 
endif 
else 
if high[1] > mysar then
reverse = 1
islong = 1
endif
endif

if islong then
if reverse then
mysar = lowvalue
af = 0.02
lowvalue = low[1]
highvalue = high[1]
else
if (highvalue > prevhighvalue and af < 0.2) then 
af = af + min(0.02, (0.2-af)) 
endif 
mysar = mysar + af * (highvalue - mysar) 
mysar = min(mysar, low[1]) 
if (barindex > 1) then
mysar = min(mysar, low[2])
endif
endif

else
if reverse then
mysar = highvalue
af = 0.02
lowvalue = low[1]
highvalue = high[1]
else
if (lowvalue < prevlowvalue and af < 0.2) then 
af = af + min(0.02, (0.2-af)) 
endif 
mysar = mysar + af * (lowvalue - mysar) 
mysar = max(mysar, high[1]) 
if (barindex > 1) then
mysar = max(mysar, high[2])
endif
endif
endif

prevhighvalue = highvalue
prevlowvalue = lowvalue
reverse = 0

REM anticipation du prochain cours
newhighvalue = max(highvalue, high)
newlowvalue = min(lowvalue, low)

if islong then
if low < mysar then 
newmysar = highvalue 
else 
if (newhighvalue > prevhighvalue and af < 0.2) then 
newaf = af + min(0.02, (0.2-af)) 
else 
newaf = af 
endif 
newmysar = mysar + newaf * (newhighvalue - mysar) 
newmysar = min(newmysar, low) 
newmysar = min(newmysar, low[1]) 
endif 
else 
if high > mysar then
newmysar = lowvalue
else
if (newlowvalue < prevlowvalue and af < 0.2) then
newaf = af + min(0.02, (0.2-af))
else
newaf = af
endif
newmysar = mysar + newaf * (newlowvalue - mysar)
newmysar = max(newmysar, high)
newmysar = max(newmysar, high[1])
endif
endif
endif

return newmysar

indicateur-prorealtime-sar.png sar-prediction.png