與matplotlib線性迴歸線給出ValueError

我想繪製散點圖上的線性迴歸線。我研究它（例如Linear regression with matplotlib/numpy），但我的執行力度不工作與matplotlib線性迴歸線給出ValueError

x = [-6.0, -5.0, -10.0, -5.0, -8.0, -3.0, -6.0, -8.0, -8.0, 7.5, 8.0, 9.0, 10.0, 7.0, 5.0, 5.0, -8.0, 8.0, 7.0] 
    y = [-7.094043198985176, -6.1018562538660044, -15.511155265492038, -2.7131460277126984, -8.6127363078417609, -3.1575686002528163, -10.246242711042497, -6.4333658386991992, -16.167988119268013, 2.4709555610646134, 4.5492058088492948, 5.5896790992867942, 3.3824425476540005, -1.8140272426684692, -1.5975329456235758, 5.1403915611396904, -4.4469105070935955, 0.51211850576547091, 5.7059436876065952] 
    m,b = numpy.polyfit(x,y,1) 
    plt.plot(x, y, x, m*x+b) 
    plt.show()

Traceback (most recent call last): 
    File "test.py", line 464, in <module> 
    correlate(trainingSet,trainingSet.trainingTexts) 
    File "test.py", line 434, in correlate 
    plt.plot(x, y, x, m*x+b) 
    File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 2458, in plot 
    ret = ax.plot(*args, **kwargs) 
    File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 3848, in plot 
    for line in self._get_lines(*args, **kwargs): 
    File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 323, in _grab_ne 
xt_args 
    for seg in self._plot_args(remaining, kwargs): 
    File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 300, in _plot_ar 
gs 
    x, y = self._xy_from_xy(x, y) 
    File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 240, in _xy_from 
_xy 
    raise ValueError("x and y must have same first dimension") 
ValueError: x and y must have same first dimension

我已檢查這兩個x和y長度相同，他們是（19 ）。任何想法我做錯了什麼？

來源

2012-06-26 Zach

的問題是，x是一個Python list，而不是一個numpyarray，所以*作品不是您所期望的方式：

>>> m * x 
[]

這是工作示例

plt.plot(x, y, x, numpy.array(x) * m +b)

來源

2012-06-26 13:17:40 unkulunkulu

你說得對。接得好。 – mgilson

我還是新來的'numpy'，我不知道_why_'m * x == []'：D – unkulunkulu

這很有趣。 m的類型是'numpy.float64'。顯然這個類型覆蓋'__mul__'（和'__rmul__'），使得'm * sequence'返回'int（m）* sequence'。如果m是一個常規的python float，由於序列不能乘以浮點數，所以會產生異常。 – mgilson

與matplotlib線性迴歸線給出ValueError

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