How to use technical indicators of TA-Lib with pandas in python

Question

I am new to python and pandas and mainly learning it to diversify my programming skills as well as of the advantage of python as a general programme language. In this programme I am using it to fetch historical data's from yahoo and do some technical analysis using functions in talib

import pandas_datareader.data as web
import datetime
import talib as ta

start = datetime.datetime.strptime('12/1/2015', '%m/%d/%Y')
end = datetime.datetime.strptime('2/20/2016', '%m/%d/%Y')
f = web.DataReader('GOOG', 'yahoo', start, end)
print 'Closing Prices'
print f['Close'].describe()
print f.Close
print ta.RSI(f.Close,2)
print ta.SMA(f.Close,2)
print ta.SMA(f.Volume,4)
print ta.ATR
print ta.ATR(f.High,f.Low,f.Close,3)

the above code works till print f.Close but then it shows this error

 print ta.RSI(f.Close,2)
TypeError: Argument 'real' has incorrect type (expected numpy.ndarray, got Series)

I have used R and its libraries for technical analysis of stocks and It have an inbuilt library called Quantmod which makes technical analysis easier and with fewer codes.

library(quantmod)
symbol=getSymbols(AAPL)
SMA=SMA(Cl(Symbol),2)

is there any similar libraries available for Python?.

As far as I remember input to `ta.xxx` should be numpy array, not pandas Series. Try `ta.RSI(f.Close.values,2)`. The same, `.values` property, applies to the other `talib` indicators — Sergey Bushmanov, Mar 14 '16 at 11:47

score 7 · Answer 1 · answered Jul 22 '17 at 15:25

7

Try with;

print ta.RSI(np.array(f.Close))

answered Jul 22 '17 at 15:25

Tim

535
1
5
14

score 3 · Answer 2 · answered Apr 29 '18 at 13:14

3

Try with

ta.RSI(f["Close"].values)

answered Apr 29 '18 at 13:14

ywllyht

31
1

1

Welcome to Stack Overflow, please read the following: https://stackoverflow.com/help/how-to-answer – Daniel Apr 29 '18 at 13:31

score 3 · Answer 3 · edited Apr 30 '18 at 13:34

Problem is you are trying to call SMA / RSI etc functions with pandas series but if you go through the TALIB documentation it shows that they require a numpy array as parameter.

So you can use this :

Close=np.array(f['close'][1:])
Modclose=np.zeroes(len(Close))
For i in range(len(Close)):
       Modclose[i]=float(Close[i])

ta.SMA(Modclose,timestamp)

The second parameter in SMA is optional though.

Hope this helps.

score 0 · Answer 4 · answered Aug 10 '18 at 06:02

0

ta.RSI expects array of values to process but it gets dataframe. So, you have to convert dataframe to array. Try this:

print ta.RSI(f.Close.values, 2)

answered Aug 10 '18 at 06:02

Muhammad Hamza Sabir

143
7

How to use technical indicators of TA-Lib with pandas in python

4 Answers4