Parabolic SAR conditions

Hello,
I am a new here and i didn't found any SAR code.
I like to use SAR as below functions:
Parabolic SAR always falling from upside to down side meaning SAR > price close.
And SAR dropped more then SAR value 5 days ago (5 days ago SAR still > price close .
How can I add this both conditions to this SAR code?
This code just add SAR indicator to the chart.
Any help will be great!

Thanks,
Amit

def psar(barsdata, iaf = 0.02, maxaf = 0.2):
length = len(barsdata)
dates = list(barsdata['Date'])
high = list(barsdata['High'])
low = list(barsdata['Low'])
close = list(barsdata['Close'])
psar = close[0:len(close)]
psarbull = [None] * length
psarbear = [None] * length
bull = True
af = iaf
ep = low[0]
hp = high[0]
lp = low[0]
for i in range(2,length):
if bull:
psar[i] = psar[i - 1] + af * (hp - psar[i - 1])
else:
psar[i] = psar[i - 1] + af * (lp - psar[i - 1])
reverse = False
if bull:
if low[i] < psar[i]:
bull = False
reverse = True
psar[i] = hp
lp = low[i]
af = iaf
else:
if high[i] > psar[i]:
bull = True
reverse = True
psar[i] = lp
hp = high[i]
af = iaf
if not reverse:
if bull:
if high[i] > hp:
hp = high[i]
af = min(af + iaf, maxaf)
if low[i - 1] < psar[i]:
psar[i] = low[i - 1]
if low[i - 2] < psar[i]:
psar[i] = low[i - 2]
else:
if low[i] < lp:
lp = low[i]
af = min(af + iaf, maxaf)
if high[i - 1] > psar[i]:
psar[i] = high[i - 1]
if high[i - 2] > psar[i]:
psar[i] = high[i - 2]
if bull:
psarbull[i] = psar[i]
else:
psarbear[i] = psar[i]
return {"dates":dates, "high":high, "low":low, "close":close, "psar":psar, "psarbear":psarbear, "psarbull":psarbull}

1 response

you should probably take a look at the history function in the help section, with that you can look back N bars
https://www.quantopian.com/help