用不相等的数据集绘制熊猫数据框

Question

I am trying to plot a pandas Data Frame that contain an unequal amount of data points (rows) and I am not sure if this is causing an issue for my plot.

in the below code, the portfolioValue# differs in length

portfolioValue1 = 521
portfolioValue1 = 500
portfolioValue1 = 521
portfolioValue1 = 521
portfolioValue1 = 425

my pandas data frame shape is

(1, 5)

Here is the python code:

portToPlot = {'AAPL.txt':[portfolioValue1], 'GOOG.txt':[portfolioValue2], 'MSFT.txt':[portfolioValue3],
    'AMZN.txt':[portfolioValue4],'CMG.txt':[portfolioValue5]}

portDFrame = DataFrame(portToPlot)

portDFrame.plot(sharex=True)

This is the error I keep getting

return array(a, dtype, copy=False, order=order)
ValueError: setting an array element with a sequence.

Answer 1

They need to be of equal length, for example, we can shorten everything to 425 elements:

portfolioValue1 = random.random(521) 
portfolioValue2 = random.random(500) 
portfolioValue3 = random.random(521) 
portfolioValue4 = random.random(521) 
portfolioValue5 = random.random(425) 
portDFrame=DataFrame(zip(portfolioValue1,portfolioValue2,portfolioValue3,portfolioValue4,portfolioValue5))
portDFrame.columns=['AAPL.txt', 'GOOG.txt', 'MSFT.txt','AMZN.txt','CMG.txt']
portDFrame.plot(sharex=True)

But it looks to me that you are working on interday stock data for one year duration. I think the reason some of them are shorter is because there are missing interday price for some trading days. You should have preserved those missing data in the first place rather than just discard them altogether.