title: Getting a wrong result calculating the RSI with Tulipy
body: <p>Im getting the candles closed price from Coinapi. The rsi I get is always different as the one I see on Tradingview. Does anyone know why it is different ? I also tried Ta-lib but it's more difficult to use.</p>
  <p>Thank you</p>
  <pre><code>import numpy as np
  import requests
  from requests.models import Response
  import pprint
  
  url = 'https://rest.coinapi.io/v1/ohlcv/BITSTAMP_SPOT_ETH_USD/latest?period_id=1HRS'
  headers = {'X-CoinAPI-Key' : '2777104B-FCC0-4010-9B4B-78F41DADEB6F'}
  r = requests.get(url, headers=headers)
  
  r=r.json()
  test2=np.array([])
  
  
  for i in range(15):
      test2=np.append(test2,r[i][&quot;price_close&quot;])
  
  print(test2)
  
  
  jcp = np.flip(test2)
  float_data = [float(x) for x in jcp]
  np_float_data = np.array(float_data)
  
  
  print(ti.rsi(np_float_data, period=14)) ```
  </code></pre>