如何在matplotlib中绘制平均线？

Question

我有2个列表使用matplotlib绘制时间序列图

r1=['14.5', '5.5', '21', '19', '25', '25']
t1=[datetime.datetime(2014, 4, 12, 0, 0), datetime.datetime(2014, 5, 10, 0, 0), datetime.datetime(2014, 6, 12, 0, 0), datetime.datetime(2014, 7, 19, 0, 0), datetime.datetime(2014, 8, 15, 0, 0), datetime.datetime(2014, 9, 17, 0, 0)]

我编写了使用这两个列表绘制图形的代码，如下所示：

xy.plot(h,r1)
xy.xticks(h,t1)
xy.plot(r1, '-o', ms=10, lw=1, alpha=1, mfc='orange')
xy.xlabel('Sample Dates')
xy.ylabel('Air Temperature')
xy.title('Tier 1 Lake Graph (JOR-01-L)')
xy.grid(True)
xy.show()

我添加了这组代码以绘制列表r1的平均值，即：

avg= (reduce(lambda x,y:x+y,r1)/len(r1))
avg1.append(avg)
avg2=avg1*len(r1)
xy.plot(h,avg2)
xy.plot(h,r1)
xy.xticks(h,t1)
xy.plot(r1, '-o', ms=10, lw=1, alpha=1, mfc='orange')
xy.xlabel('Sample Dates')
xy.ylabel('Air Temperature')
xy.title('Tier 1 Lake Graph (JOR-01-L)')
xy.grid(True)
xy.show()

但是代码开始抛出错误，提示：

Traceback (most recent call last):
  File "C:\Users\Ayush\Desktop\UWW Data Examples\new csvs\temp.py", line 63, in <module>
    avg= (reduce(lambda x,y:x+y,r1)/len(r1))
TypeError: unsupported operand type(s) for /: 'str' and 'int'

matplotlib中是否有任何直接方法可将平均线添加到图中？ 感谢帮助..

Answer 1

r1是一个字符串列表，而不是实际的floats/ints因此显然您不能将字符串除以int，您需要在传递lambda之前将其强制转换为float或将列表内容转换为float ，然后再传递它：

r1 = ['14.5', '5.5', '21', '19', '25', '25']
r1[:] = map(float,r1)

所做的更改确实有效：

In [3]: r1=['14.5', '5.5', '21', '19', '25', '25']    
In [4]: avg= (reduce(lambda x,y:x+y,r1)/len(r1))
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-4-91fbcb81cdb6> in <module>()
----> 1 avg= (reduce(lambda x,y:x+y,r1)/len(r1))    
TypeError: unsupported operand type(s) for /: 'str' and 'int'    
In [5]: r1[:] = map(float,r1)    
In [6]: avg= (reduce(lambda x,y:x+y,r1)/len(r1))    
In [7]: avg
Out[7]: 18.333333333333332

同样，使用sum将更容易获得平均值：

avg = sum(r1) / len(r1)