title: `ValueError: x and y must be the same size` when calling mplfinance
body: <pre><code>import mplfinance as mpf
  import talib as ta
  import matplotlib.pyplot as plt
  import numpy as np
  %matplotlib notebook
  test=df
  WMA20 = ta.WMA(test['close'], timeperiod=20)
  WMA60 = ta.WMA(test['close'], timeperiod=60)
  WMA100 = ta.WMA(test['close'], timeperiod=100)
  WMA200 = ta.WMA(test['close'], timeperiod=200)
  
  # Set buy signals if current price is higher than 50-day MA
  test['Buy'] = (test['close'] &gt; WMA20) &amp; (test['close'].shift(1) &lt;= WMA20)
  
  #plot
  tcdf =test[['close']]
  tcdf=tcdf.reset_index()
  tcdf['date'] = tcdf['date'].apply(lambda x: x.value)
  
  for i in range(len(test['Buy'])):
      if test['Buy'][i]==True:
         
          apd = mpf.make_addplot(tcdf.iloc[i],type='scatter',markersize=20,marker='o')
  
  
  mpf.plot(test,addplot=apd, type='candle',volume=True)
  </code></pre>
  <p>I run this code and get this eror
  ---&gt; 33 mpf.plot(test,addplot=apd, type='candle',volume=True)
  ValueError: x and y must be the same size</p>
  <p>how I can fix it</p>
  <p>tcdf:</p>
  <pre><code>    date    close
  0   1597622400000000000     16.560
  1   1597708800000000000     16.120
  2   1597795200000000000     15.834
  3   1597881600000000000     17.842
  4   1597968000000000000     16.387
  5   1598054400000000000     18.936
  6   1598140800000000000     18.170
  7   1598227200000000000     18.074
  8   1598313600000000000     17.023
  9   1598400000000000000     17.322
  10  1598486400000000000     17.649
  11  1598572800000000000     18.294
  </code></pre>
  <p>test:</p>
  <pre><code>time    open    high    low     close   volume  year    month   day     hour    Day_of_week     Buy     BelowMA
  date                                                    
  2020-08-17  00:00:00    15.499  16.956  15.228  16.560  1297237.309     2020    8   17  0   0   False   False
  2020-08-18  00:00:00    16.560  17.578  16.010  16.120  968575.523  2020    8   18  0   1   False   False
  2020-08-19  00:00:00    16.119  17.080  15.465  15.834  987213.085  2020    8   19  0   2   False   False
  2020-08-20  00:00:00    15.825  17.949  15.807  17.842  915874.788  2020    8   20  0   3   False   False
  2020-08-21  00:00:00    17.842  19.854  16.361  16.387  2428489.231     2020    8   21  0   4   False   False
  2020-08-22  00:00:00    16.368  19.191  15.623  18.936  1969925.069     2020    8   22  0   5   False   False
  2020-08-23  00:00:00    18.935  19.757  17.715  18.170  1223037.344     2020    8   23  0   6   False   False
  2020-08-24  00:00:00    18.187  19.467  17.900  18.074  835648.518  2020    8   24  0   0   False   False
  2020-08-25  00:00:00    18.068  18.261  16.132  17.023  1116590.644     2020    8   25  0   1   False   False
  2020-08-26  00:00:00    17.023  18.040  16.837  17.322  1003044.736     2020    8   26  0   2   False   False
  2020-08-27  00:00:00    17.324  18.200  16.420  17.649  1141649.079     2020    8   27  0   3   False   False
  ... .
  </code></pre>
  <p>I dont know why I get this eror</p>
  <p>this line for error real number</p>
  <pre><code>tcdf['date'] = tcdf['date'].apply(lambda x: x.value)
  </code></pre>
  <p>when it is not exist i get error
  must be real number, not Timestamp</p>