matpolotlib FixedLocator与日期 [英] matpolotlib FixedLocator with dates

问题描述

如果我有一个基于日期的X轴，如何使用股票代码API在所需的位置添加股票代码？使用 FixedLocator 不起作用，并导致异常：

 以pd 
的形式导入pd 
以plt 
的形式导入matplotlib.pyplot以$ p 
的形式导入matplotlib.ticker的熊猫= $ d $ date_range（'20130101'，periods = 6）
系列= pd.Series（[1,3,5,8,6,8]，index =日期）
p = plt.figure（）
 series.plot（ax = p.gca（））
 p.gca（）。xaxis.set_major_locator（matplotlib.ticker.FixedLocator（dates））
  

结果：

 跟踪（最近一次通话最近）：
 File / media / local_data / languitar / miniconda2 / envs / monitoring / lib / python2.7 / site-packages / matplotlib / backends / backend 
 _qt5agg.py，第176行，位于__draw_idle_agg 
 FigureCanvasAgg.draw（self）
 File /媒体/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/backends/backend 
 _agg.py，行474，在平局
 self.figure.draw中（self.renderer）
文件 / media / local_data / languitar / miniconda2 / envs / monito ring / lib / python2.7 / site-packages / matplotlib / artist.py，行
 61，在draw_wrapper 
中draw（artist，renderer，* args，** kwargs）
文件 /media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/figure.py，行
 1159，在平局
 func（* args）
文件 /media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/artist.py，
 61行，位于draw_wrapper 
 draw（艺术家，渲染器，* args，** kwargs）
文件 /media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/axes/_base.py，
 2324行，绘制
 a.draw（renderer）
文件 /media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/artist .py，
 61行，在draw_wrapper 
 draw（艺术家，渲染器，* args，** kwargs）中
 File / media / local_data / languitar / miniconda2 / envs / monitoring / lib /python2.7/site-packages/matplotlib/axis.py，第1行
 106，在抽奖
 ticks_to_draw = self._update_ticks（renderer）
 File /media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/axis中。 py，第1行
 038，如果不是mtransforms.interval_contains（interval_expanded，loc），则在_update_ticks 
中：
文件 / media / local_data / languitar / miniconda2 / envs / monitoring / lib / python2 .7 / site-packages / matplotlib / transforms.py，
第2780行，位于interval_contains 
（（a< b）和（a< = val和b> = val））
 TypeError：无效的类型提升
  

解决方案

好，在将日期传递给定位器之前，用 matplotlib.dates.date2num 转换日期时，工作正常。 / p>

In case I have a date-based x-axis, how can I add ticks at desired positions using the ticker API? Using a FixedLocator doesn't work and results in an exception:

import pandas as pd
import matplotlib.pyplot as plt
import matplotlib.ticker

dates = pd.date_range('20130101',periods=6)
series = pd.Series([1,3,5,8,6,8], index=dates)
p = plt.figure()
series.plot(ax=p.gca())
p.gca().xaxis.set_major_locator(matplotlib.ticker.FixedLocator(dates))

results in:

Traceback (most recent call last):
  File "/media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/backends/backend
_qt5agg.py", line 176, in __draw_idle_agg
    FigureCanvasAgg.draw(self)
  File "/media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/backends/backend
_agg.py", line 474, in draw
    self.figure.draw(self.renderer)
  File "/media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/artist.py", line
 61, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/figure.py", line
 1159, in draw
    func(*args)
  File "/media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/artist.py", line
 61, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/axes/_base.py", 
line 2324, in draw
    a.draw(renderer)
  File "/media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/artist.py", line
 61, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/axis.py", line 1
106, in draw
    ticks_to_draw = self._update_ticks(renderer)
  File "/media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/axis.py", line 1
038, in _update_ticks
    if not mtransforms.interval_contains(interval_expanded, loc):
  File "/media/local_data/languitar/miniconda2/envs/monitoring/lib/python2.7/site-packages/matplotlib/transforms.py", 
line 2780, in interval_contains
    ((a < b) and (a <= val and b >= val))
TypeError: invalid type promotion

解决方案

Ok, when converting the dates with matplotlib.dates.date2num before passing them to the locator things work.

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