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Merge pull request #2341 from hroff-1902/indicator-helper 

Remove indicator_helpers.py and test
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Matthias 2019-10-07 19:36:09 +02:00 committed by GitHub
parent a7418449f9 e1b8485b51
commit 7d1f66ccf8
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40
freqtrade/indicator_helpers.py
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from math import cos, exp, pi, sqrt
import numpy as np
import talib as ta
from pandas import Series
def went_up(series: Series) -> bool:
return series > series.shift(1)
def went_down(series: Series) -> bool:
return series < series.shift(1)
def ehlers_super_smoother(series: Series, smoothing: float = 6) -> Series:
magic = pi * sqrt(2) / smoothing
a1 = exp(-magic)
coeff2 = 2 * a1 * cos(magic)
coeff3 = -a1 * a1
coeff1 = (1 - coeff2 - coeff3) / 2
filtered = series.copy()
for i in range(2, len(series)):
filtered.iloc[i] = coeff1 * (series.iloc[i] + series.iloc[i-1]) + \
coeff2 * filtered.iloc[i-1] + coeff3 * filtered.iloc[i-2]
return filtered
def fishers_inverse(series: Series, smoothing: float = 0) -> np.ndarray:
""" Does a smoothed fishers inverse transformation.
Can be used with any oscillator that goes from 0 to 100 like RSI or MFI """
v1 = 0.1 * (series - 50)
if smoothing > 0:
v2 = ta.WMA(v1.values, timeperiod=smoothing)
else:
v2 = v1
return (np.exp(2 * v2)-1) / (np.exp(2 * v2) + 1)

15
tests/test_indicator_helpers.py
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# pragma pylint: disable=missing-docstring
import pandas as pd
from freqtrade.indicator_helpers import went_down, went_up
def test_went_up():
series = pd.Series([1, 2, 3, 1])
assert went_up(series).equals(pd.Series([False, True, True, False]))
def test_went_down():
series = pd.Series([1, 2, 3, 1])
assert went_down(series).equals(pd.Series([False, False, False, True]))