def ULTOSC(df):
TR_l = TR(df)
BP_l = df['close'] - pd.concat([df['low'], df['close'].shift(1)], axis=1).min(axis=1)
UltO = pd.Series((4 * pd.rolling_sum(BP_l, 7) / pd.rolling_sum(TR_l, 7)) + (2 * pd.rolling_sum(BP_l, 14) / pd.rolling_sum(TR_l, 14)) + (pd.rolling_sum(BP_l, 28) / pd.rolling_sum(TR_l, 28)), name = 'UltOsc')
return UltO
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