[英]Matplotlib: Formatting time on x-axis of stacked horizontal bar graph
[英]Matplotlib: Formatting dates on the x-axis in a 3D Bar graph
鑒於此3D 條形圖示例代碼,您將如何將 x 軸中的數字數據轉換為格式化的日期/時間字符串? 我嘗試使用 ax.xaxis_date() 函數但沒有成功。 我還嘗試使用 plot_date(),它似乎不適用於 3D 條形圖。 這是示例代碼的修改版本,用於說明我正在嘗試執行的操作:
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import numpy as np
import matplotlib.dates as dates
dates = [dates.date2num(datetime.datetime(2009,3,12)),
dates.date2num(datetime.datetime(2009,6,9)),
dates.date2num(datetime.datetime(2010,1,1)),
#etc...
]
fig = plt.figure()
ax = Axes3D(fig)
for c, z in zip(['r', 'g', 'b', 'y'], [30, 20, 10, 0]):
xs = np.array(dates)
ys = np.random.rand(20)
ax.bar(xs, ys, zs=z, zdir='y', color=c, alpha=0.8)
ax.set_xlabel('Date & Time')
ax.set_ylabel('Series')
ax.set_zlabel('Amount')
plt.show()
這里可能有些混亂,Axes3D 具有用於軸的屬性 w_xaxis、w_yaxis 和 w_zaxis,而不是通常的 xaxix、yaxis 等。
UPDATE現在使用函數來格式化標簽。
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import numpy as np
import matplotlib.dates as dates
import datetime, random
import matplotlib.ticker as ticker
def random_date():
date = datetime.date(2008, 12, 1)
while 1:
date += datetime.timedelta(days=30)
yield (date)
def format_date(x, pos=None):
return dates.num2date(x).strftime('%Y-%m-%d') #use FuncFormatter to format dates
r_d = random_date()
some_dates = [dates.date2num(next(r_d)) for i in range(0,20)]
fig = plt.figure(figsize=(10, 10))
ax = Axes3D(fig,rect=[0,0.1,1,1]) #make room for date labels
for c, z in zip(['r', 'g', 'b', 'y'], [30, 20, 10, 0]):
xs = np.array(some_dates)
ys = np.random.rand(20)
ax.bar(xs, ys, zs=z, zdir='y', color=c, alpha=0.8,width=8)
ax.w_xaxis.set_major_locator(ticker.FixedLocator(some_dates)) # I want all the dates on my xaxis
ax.w_xaxis.set_major_formatter(ticker.FuncFormatter(format_date))
for tl in ax.w_xaxis.get_ticklabels(): # re-create what autofmt_xdate but with w_xaxis
tl.set_ha('right')
tl.set_rotation(30)
ax.set_ylabel('Series')
ax.set_zlabel('Amount')
plt.show()
產生:
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