質問編集履歴
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エラーメッセージを全文貼り付けました。
test
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test
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### 発生している問題・エラーメッセージ
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ValueError Traceback (most recent call last)
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<ipython-input-37-ae5de46a8aa2> in <module>
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----> 1 plt.polar(phi, sigma(f, -10, 10))
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~\anaconda3\lib\site-packages\matplotlib\pyplot.py in polar(*args, **kwargs)
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2321 'that does not have a polar projection.')
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2322 ax = gca(polar=True)
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-> 2323 ret = ax.plot(*args, **kwargs)
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2324 return ret
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2325
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~\anaconda3\lib\site-packages\matplotlib\axes\_axes.py in plot(self, scalex, scaley, data, *args, **kwargs)
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1741 """
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1742 kwargs = cbook.normalize_kwargs(kwargs, mlines.Line2D)
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-> 1743 lines = [*self._get_lines(*args, data=data, **kwargs)]
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1744 for line in lines:
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1745 self.add_line(line)
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~\anaconda3\lib\site-packages\matplotlib\axes\_base.py in __call__(self, data, *args, **kwargs)
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271 this += args[0],
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272 args = args[1:]
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--> 273 yield from self._plot_args(this, kwargs)
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275 def get_next_color(self):
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~\anaconda3\lib\site-packages\matplotlib\axes\_base.py in _plot_args(self, tup, kwargs)
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377 # element array of None which causes problems downstream.
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378 if any(v is None for v in tup):
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--> 379 raise ValueError("x, y, and format string must not be None")
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381 kw = {}
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ValueError: x, y, and format string must not be None
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