SMA 未在正常价格图表旁边正确绘制

如何解决SMA 未在正常价格图表旁边正确绘制

change = price['adjclose'].diff(1)
change.dropna(inplace=True)

positive = change.copy()
negative = change.copy()

positive[positive<0] = 0
negative[negative>0] = 0

days = 10

average_gain = positive.rolling(window=days).mean()
average_loss = abs(negative.rolling(window=days).mean())

simple_moving_average = change.rolling(window=days).mean()

relative_strength = average_gain/average_loss
RSI = 100.0-(100.0/(1.0+relative_strength))

combined = pd.DataFrame()
combined['adjclose'] = price['adjclose']
combined['RSI'] = RSI
combined['SMA'] = simple_moving_average



#PLottING

plt.figure(figsize=(12,8))
ax1 = plt.subplot(211)
ax1.plot(combined.index,combined['adjclose'],color='lightgrey')
ax1.plot(combined['SMA'],color='green')
ax1.set_title("Adjusted Close Price",color='white')
ax1.grid(True,color='#555555')
ax1.set_axisbelow(True)
ax1.set_facecolor('black')
ax1.figure.set_facecolor('#121212')
ax1.tick_params(axis='x',colors='white')
ax1.tick_params(axis='y',colors='white')

RSI 图表显示正确。然而，当在价格旁边绘制 SMA 时，SMA 的值非常低，甚至不接近实际价格。我做错了什么？