python - 在直方图中绘制列表列表 - x 和 y 值

Question

我有一个列表列表:

[[Decimal('3.69578'), Decimal('5.12519')], [Decimal('3.69586'),Decimal('2.50457468')], [Decimal('3.69587'), Decimal('72.33894358')], [Decimal('3.69629'), Decimal('54.2359599')], ...]

我想使用 matplotlib 将子列表中的一个值作为 x 轴，将另一个值作为 y 轴，将其绘制成直方图。

plt.hist(list)

给我:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/matplotlib/pyplot.py", line 2896, in hist
stacked=stacked, **kwargs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/axes/_axes.py", line 5652, in hist
    m, bins = np.histogram(x[i], bins, weights=w[i], **hist_kwargs)
  File "/usr/lib/python2.7/dist-packages/numpy/lib/function_base.py", line 176, in histogram
    mn, mx = [mi+0.0 for mi in range]
TypeError: unsupported operand type(s) for +: 'Decimal' and 'float'

Answer 1

你可以将它们绘制成 float

plt.hist([[float(x) for x in y] for y in list])