使用groupby函数绘制图的问题

Question

我的数据框看起来像这样：-

df1.set_index('date', inplace=True)

date        symbol   roe
2019-12-31  FMC 21.2189
2018-12-31  FMC 16.7456
2017-12-31  FMC -4.9167
2016-12-31  FMC 6.5580
2015-12-31  FMC -11.1408
2014-12-31  FMC 19.6675
2013-12-31  FMC 23.6372
2012-12-31  FMC 29.7916
2011-12-31  FMC 32.2291
2010-12-31  FMC 18.3737
2009-12-31  FMC 22.6811
2008-12-31  FMC 35.8547
2007-12-31  FMC 15.6253
2006-12-31  FMC 14.2645
2005-12-31  FMC 11.2999
2019-12-31  VMC 21.2189
2018-12-31  VMC 16.7456
2017-12-31  VMC -4.9167
2016-12-31  VMC 6.5580
2015-12-31  VMC -11.1408
2014-12-31  VMC 19.6675
2013-12-31  VMC 23.6372
2012-12-31  VMC 29.7916
2011-12-31  VMC 32.2291
2010-12-31  VMC 18.3737
2009-12-31  VMC 22.6811
2008-12-31  VMC 35.8547
2007-12-31  VMC 15.6253
2006-12-31  VMC 14.2645
2005-12-31  VMC 11.2999
2019-12-31  APD 21.2189
2018-12-31  APD 16.7456
2017-12-31  APD -4.9167
2016-12-31  APD 6.5580
2015-12-31  APD -11.1408
2014-12-31  APD 19.6675
2013-12-31  APD 23.6372
2012-12-31  APD 29.7916
2011-12-31  APD 32.2291
2010-12-31  APD 18.3737
2009-12-31  APD 22.6811
2008-12-31  APD 35.8547
2007-12-31  APD 15.6253
2006-12-31  APD 14.2645
2005-12-31  APD 11.2999
2019-12-31  MLM 21.2189
2018-12-31  MLM 16.7456
2017-12-31  MLM -4.9167
2016-12-31  MLM 6.5580
2015-12-31  MLM -11.1408
2014-12-31  MLM 19.6675
2013-12-31  MLM 23.6372
2012-12-31  MLM 29.7916
2011-12-31  MLM 32.2291
2010-12-31  MLM 18.3737
2009-12-31  MLM 22.6811
2008-12-31  MLM 35.8547
2007-12-31  MLM 15.6253
2006-12-31  MLM 14.2645
2005-12-31  MLM 11.2999
2019-12-31  NEM 21.2189
2018-12-31  NEM 16.7456
2017-12-31  NEM -4.9167
2016-12-31  NEM 6.5580
2015-12-31  NEM -11.1408
2014-12-31  NEM 19.6675
2013-12-31  NEM 23.6372
2012-12-31  NEM 29.7916
2011-12-31  NEM 32.2291
2010-12-31  NEM 18.3737
2009-12-31  NEM 22.6811
2008-12-31  NEM 35.8547
2007-12-31  NEM 15.6253
2006-12-31  NEM 14.2645
2005-12-31  NEM 11.2999

我已经将日期设置为索引，并且使用groupby函数绘制图形，并且代码如下所示：-

df1.groupby('symbol')['roe'].plot(figsize = (8, 6), legend=True)

输出仅显示1行。我除了输出将显示5个不同的图形，因为在数据框中有5个不同的符号，请问我该如何解决这个问题？

Answer 1

您可能需要检查数据的生成/来源。您的绘图代码完全有效，得出：

这似乎是五个相同的情节。快速枢纽显示您确实对所有符号都具有相同的roe ：

df.pivot('date','symbol','roe')

输出：

symbol          APD      FMC      MLM      NEM      VMC
date                                                   
2005-12-31  11.2999  11.2999  11.2999  11.2999  11.2999
2006-12-31  14.2645  14.2645  14.2645  14.2645  14.2645
2007-12-31  15.6253  15.6253  15.6253  15.6253  15.6253
2008-12-31  35.8547  35.8547  35.8547  35.8547  35.8547
2009-12-31  22.6811  22.6811  22.6811  22.6811  22.6811
2010-12-31  18.3737  18.3737  18.3737  18.3737  18.3737
2011-12-31  32.2291  32.2291  32.2291  32.2291  32.2291
2012-12-31  29.7916  29.7916  29.7916  29.7916  29.7916
2013-12-31  23.6372  23.6372  23.6372  23.6372  23.6372
2014-12-31  19.6675  19.6675  19.6675  19.6675  19.6675
2015-12-31 -11.1408 -11.1408 -11.1408 -11.1408 -11.1408
2016-12-31   6.5580   6.5580   6.5580   6.5580   6.5580
2017-12-31  -4.9167  -4.9167  -4.9167  -4.9167  -4.9167
2018-12-31  16.7456  16.7456  16.7456  16.7456  16.7456
2019-12-31  21.2189  21.2189  21.2189  21.2189  21.2189