Question

我需要在箱线图中添加一条水平线。通过holoviews手册进行了查看，似乎应该在这种情况下使用HLine。不幸的是我得到一个错误：

ValueError: all the input arrays must have same number of dimensions

示例：

import numpy as np
import holoviews as hv
from holoviews import opts

hv.extension('bokeh')

groups = [chr(65+g) for g in np.random.randint(0, 3, 200)]

boxwhisker = hv.BoxWhisker(
    (groups, np.random.randint(0, 5, 200), np.random.randn(200)),
    ['Group', 'Category'], 
    'Value'
).sort() * hv.HLine(1)

boxwhisker.opts(
    opts.BoxWhisker(
        box_color='white', 
        height=400, 
        show_legend=False, 
        whisker_color='gray', 
        width=600
    ),
    opts.HLine(color='green', line_width=2)
)

layout = hv.Layout(boxwhisker)
hv.save(layout, 'boxplot.html')

跟踪：

File "/home/python3.6/site-packages/holoviews/plotting/renderer.py", line 545, in save
    plot = self_or_cls.get_plot(obj)
  File "/home/python3.6/site-packages/holoviews/plotting/bokeh/renderer.py", line 135, in get_plot
    plot = super(BokehRenderer, self_or_cls).get_plot(obj, renderer, **kwargs)
  File "/home/python3.6/site-packages/holoviews/plotting/renderer.py", line 207, in get_plot
    plot.update(init_key)
  File "/home/python3.6/site-packages/holoviews/plotting/plot.py", line 595, in update
    return self.initialize_plot()
  File "/home/python3.6/site-packages/holoviews/plotting/bokeh/plot.py", line 995, in initialize_plot
    subplots = subplot.initialize_plot(ranges=ranges, plots=shared_plots)
  File "/home/python3.6/site-packages/holoviews/plotting/bokeh/plot.py", line 1115, in initialize_plot
    adjoined_plots.append(subplot.initialize_plot(ranges=ranges, plots=passed_plots))
  File "/home/python3.6/site-packages/holoviews/plotting/bokeh/element.py", line 2058, in initialize_plot
    self._update_ranges(element, ranges)
  File "/home/python3.6/site-packages/holoviews/plotting/bokeh/element.py", line 747, in _update_ranges
    xfactors, yfactors = self._get_factors(element, ranges)
  File "/home/python3.6/site-packages/holoviews/plotting/bokeh/element.py", line 2031, in _get_factors
    xfactors = np.concatenate(xfactors)
ValueError: all the input arrays must have same number of dimensions

Answer 1

是的，HLine是执行此操作的正确方法，但不幸的是，目前HoloViews中对分类轴的支持受到限制，并且将不允许此类覆盖。对于未完成的alternative implementation for categorical axes，有一些工作可以解决此问题。同时，我假设您可以添加一个custom hook，但这很难弄清楚。

请注意，无论如何，hv.Layout(boxwhisker)都无法像上面那样工作；它应该是hv.Layout([boxwhisker])或仅仅是boxwhisker（因为Layout需要一个列表，但是在这里您甚至不需要布局，因为您只有一个项目）。

如何在BoxWhisker holoviews图上添加自定义线？

1 个答案: