matplotlib 错误：ValueError：x 和 y 必须具有相同的第一维

Question

我正在尝试使用 matplotlib 绘制两个列表，但我收到关于 x 和 y 维度的错误。其中一个列表包含日期和其他数字，您可以查看列表的内容，我已将它们打印在下面。

我尝试使用 len() 检查列表的长度，它们似乎相等，所以我有点迷茫。我已经检查了几个关于这个错误的问题，但运气不佳。

注意：“查询”包含我的 SQL 查询，为简单起见，我没有包括在内。

#####我的代码

t = 0
for row in query:
    data = query[t]
    date.append(data[0])
    close.append(data[1])
    t = t + 1

print "date = ", date
print "close = ", close
print "date length = ", len(date)
print "close length = ", len(close)

def plot2():
    plt.plot(date, close)
    plt.show()

plot2()

#

我的脚本的输出：

date =  [datetime.datetime(2010, 1, 31, 22, 0), datetime.datetime(2010, 1, 31, 22, 1), datetime.datetime(2010, 1, 31, 22, 2), datetime.datetime(2010, 1, 31, 22, 3), datetime.datetime(2010, 1, 31, 22, 4), datetime.datetime(2010, 1, 31, 22, 5), datetime.datetime(2010, 1, 31, 22, 6), datetime.datetime(2010, 1, 31, 22, 7), datetime.datetime(2010, 1, 31, 22, 8), datetime.datetime(2010, 1, 31, 22, 9), datetime.datetime(2010, 1, 31, 22, 10)]

close =  [1.5945, 1.5946, 1.59465, 1.59505, 1.59525, 1.59425, 1.5938, 1.59425, 1.59425, 1.5939, 1.5939]

date length =  11

close length =  11

Traceback (most recent call last):
  File "script.py", line 234, in <module>
    plot2()
  File "script.py", line 231, in plot2
    plt.plot(date, close)
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 2467, in plot
    ret = ax.plot(*args, **kwargs)
  File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 3893, in plot
    for line in self._get_lines(*args, **kwargs):
  File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 322, in _grab_next_args
    for seg in self._plot_args(remaining, kwargs):
  File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 300, in _plot_args
    x, y = self._xy_from_xy(x, y)
  File "/usr/lib/pymodules/python2.7/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

提前致谢。

Answer 1

使用您的数据为我工作。

更改代码并将打印语句放入函数中。

def plot2():
    print "date = ", date
    print "close = ", close
    print "date length = ", len(date)
    print "close length = ", len(close)
    plt.plot(date, close)
    plt.show()

你的代码中一定有什么东西没有显示出来。