numpy的linspace和繪圖，ValueError異常：用序列

我試圖獲得的圓的60行接合中心到60個不同的等間隔的點上在下面的程序中的圓周上，numpy的linspace和繪圖，ValueError異常：用序列

import matplotlib.pyplot as plt 
import numpy as np 

figure = plt.figure(figsize=(10, 10)) 

theta = np.linspace(0, 2 * np.pi, 60) 
r = 3.0 
x1 = r * np.cos(theta) 
y1 = r * np.sin(theta) 

plt.plot(x1, y1, color='blue') 
plt.plot([0, x1], [0, y1], color='gray') 

plt.axis([-4, 4, -4, 4]) 
plt.grid(True) 

figure.tight_layout() 
figure.savefig('test.png', facecolor='white', edgecolor='black')

的數組元素它提供了以下錯誤，

$ python test.py 
Traceback (most recent call last): 
    File "test.py", line 12, in <module> 
    plt.plot([0, x1], [0, y1], color='gray') 
    File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 2987, in plot 
    ret = ax.plot(*args, **kwargs) 
    File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 4137, in plot 
    for line in self._get_lines(*args, **kwargs): 
    File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 317, in _grab_next_args 
    for seg in self._plot_args(remaining, kwargs): 
    File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 288, in _plot_args 
    y = np.atleast_1d(tup[-1]) 
    File "/usr/lib/python2.7/dist-packages/numpy/core/shape_base.py", line 49, in atleast_1d 
    ary = asanyarray(ary) 
    File "/usr/lib/python2.7/dist-packages/numpy/core/numeric.py", line 512, in asanyarray 
    return array(a, dtype, copy=False, order=order, subok=True) 
ValueError: setting an array element with a sequence.

如果我使用了一些固定值，例如plt.plot([0, 0], [0, r], color='gray')而不是plt.plot([0, x1], [0, y1], color='gray')它的工作原理。這似乎與numpy.linspace這樣的情節是不可能的。

我發現類似的問題ValueError: setting an array element with a sequence，但並沒有幫助我。我是python的新手，請耐心等待。

來源

2016-06-21 souravc

x和y的plot()命令的元素需要有相同數量的元素。用以下替換行

plt.plot([0, x1], [0, y1], color='gray')

：

plt.plot([np.zeros(60,), x1], [np.zeros(60,), y1], color='gray')

的結果是這樣的：

來源

2016-06-21 19:38:33 benten

numpy的linspace和繪圖，ValueError異常：用序列

回答

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