matplotlib datetime.datetime和浮动错误

Question

这是打印以下散点图时间/美元，然后通过

from datetime import datetime 
from numpy import * 
import numpy as np 
from matplotlib.pyplot import * 
import matplotlib.pyplot as plt 


dateStimeSList = [datetime(2015, 11, 24, 14, 27, 47), datetime(2015, 11, 24, 14, 57, 21), datetime(2015, 11, 24, 12, 4, 26), datetime(2015, 11, 24, 12, 4, 11), datetime(2015, 11, 24, 12, 3, 41), datetime(2015, 11, 24, 12, 7, 51), datetime(2015, 11, 24, 12, 7, 48), datetime(2015, 11, 23, 10, 54, 31), datetime(2015, 11, 24, 12, 3, 38), datetime(2015, 11, 23, 10, 58, 58), datetime(2015, 11, 23, 10, 58, 54), datetime(2015, 11, 23, 10, 58, 50), datetime.datetime(2015, 11, 23, 10, 58, 46), datetime(2015, 11, 23, 10, 58, 42), datetime(2015, 11, 21, 7, 56, 1), datetime(2015, 11, 19, 16, 46, 25), datetime(2015, 11, 17, 15, 51, 21)] 

priceList = [23.5, 23.0, 22.0, 21.0, 16.0, 13.0, 12.0, 11.0, 11.0, 10.0, 9.0, 8.0, 7.0, 6.0, 5.0, 1.0, 0.99] 

plt.plot(dateStimeSList, priceList,'ro') 

coefficients = np.polyfit(dateStimeSList, priceList, 3) 
polynomial = poly1d(coefficients) 
ys = polynomial(priceList) 
plot(dateStimeSList, ys) 

plt.ylabel('USD') 
plt.xlabel('Date/Time') 

plt.show() 

运行最佳拟合3次多项式运行错误

Traceback (most recent call last): 
    File "C:/Python34/---/Tv0.0.py", line 50, in <module> 
    coefficients = np.polyfit(d, priceList, 3) 
    File "C:\Python34\lib\site-packages\numpy\lib\polynomial.py", line 543, in polyfit 
    x = NX.asarray(x) + 0.0 
TypeError: unsupported operand type(s) for +: 'datetime.datetime' and 'float' 

发生了什么事这里？

Answer 1

最不雅的解决方案

tList = [] 
t = 0 
while t < len(dateStimeSList): 
    ti = int(time.mktime(dateStimeSList[t].timetuple())) 
    tList.append(ti) 
    t = t + 1 

plt.plot(tList, priceList,'ro') 

z = np.polyfit(tList, priceList, 15) 
f = np.poly1d(z) 
print(f) 
x_new = np.linspace(tList[0], tList[-1], 50) 
y_new = f(x_new) 
plt.plot(tList,priceList,'o', x_new, y_new) 

plt.ylabel('USD') 
plt.xlabel('Date/Time') 

plt.show()