[英]How do i get the x axis to only show my data i want to plot? Instead of it including labels with no plots?
我正在繪制日期與整數。 但是因為日期范圍相隔100天,所以matplotlib會自動包含100天之間的每個日期,即使只有20個左右的數據也可以繪制。 所以我的問題是,如何讓x軸只生成有數據繪制的日期? 此外,目前日期是以橫向方式壓扁的,我如何以垂直方式獲取它們以便更適合?
這是我的圖表的圖片:
這是我的代碼:
import datetime as dt
import matplotlib.dates as mdates
array1 = ['2014-10-28', '2014-11-17', '2014-09-29', '2014-10-17', '2014-10-22']
array2 = [1,4,5,6,9]
x = [dt.datetime.strptime(a,'%Y-%m-%d').date() for a in array1]
plt.plot_date((x), (array2), 'ro')
plt.show()
好的,首先,您可以使用fig.autofmt_xdate()
函數自動處理xtick標簽 - 這是最簡單的方法。
所以你會有這樣的事情:
import datetime as dt
import matplotlib.dates as mdates
from matplotlib import pyplot
from random import randint
array1 = ['2014-10-28', '2014-11-17', '2014-09-29', '2014-10-17', '2014-10-22']
array2 = [1,4,5,6,9]
dates = ["2014-{month:0>2d}-{day:0>2d}".format(month=m, day=d) for m in [1,5] for d in range(1,32)]
dates = [dt.datetime.strptime(d, '%Y-%m-%d').date() for d in dates]
freqs = [randint(0,4) for _ in dates]
fig = pyplot.figure()
ax = fig.add_subplot(1,1,1)
ax.plot_date(dates, freqs, "ro")
fig.autofmt_xdate()
pyplot.show()
仍然有你不想要的大差距,但刻度標簽更好。
接下來,為了處理拆分,有一些選項,但它們不在主matplotlib(我知道)。 這是通過實際繪制兩個圖,在中間刪除刺,並使用sharey
選項完成的:
import datetime as dt
import matplotlib.dates as mdates
from matplotlib import pyplot
from random import randint
from matplotlib.ticker import MaxNLocator
dates = ["2014-{month:0>2d}-{day:0>2d}".format(month=m, day=d) for m in [1,5] for d in range(1,10)]
dates = [dt.datetime.strptime(d, '%Y-%m-%d').date() for d in dates]
freqs = [randint(0,4) for _ in dates]
fig = pyplot.figure()
ax1 = fig.add_subplot(1,2,1)
ax2 = fig.add_subplot(1,2,2, sharey=ax1)
ax1.plot_date(dates, freqs, "ro")
ax2.plot_date(dates, freqs, "ro")
#set the upper and lower bounds for the two adjacent plots
ax1.set_xlim(xmax=dt.datetime.strptime("2014-01-11", '%Y-%m-%d').date())
ax2.set_xlim(xmin=dt.datetime.strptime("2014-05-01", '%Y-%m-%d').date())
for ax in [ax1, ax2]:
_ = ax.get_xticklabels() #For some reason, if i don't do this, then it only prints years for the tick labels. :/
ax.xaxis.set_major_locator(mdates.AutoDateLocator(maxticks=6))
#Turn off the spines in the middle
ax1.spines['right'].set_visible(False)
ax2.spines['left'].set_visible(False)
ax1.yaxis.tick_left()
ax2.get_yaxis().set_visible(False)
pyplot.subplots_adjust(wspace=0.1)
fig.autofmt_xdate()
pyplot.show()
還有一些額外的東西需要清理,但我想你明白了。
您可以旋轉xtick標簽:
plt.xticks(rotation=45)
並使用以下方法在x軸上均勻繪制日期:
x = np.arange(n)
ax.plot(x, array2, 'ro')
然后重新標記xticks:
locs = x
labels = [d.strftime('%b %d') for d in dates]
plt.xticks(locs, labels)
但請注意,手動設置位置和標簽的副作用是刻度將不再像使用GUI平移或縮放工具時通常那樣自動適應刻度的變化。
import time
import datetime as dt
import numpy as np
import matplotlib.dates as mdates
import matplotlib.pyplot as plt
n, m = 20, 30
now = dt.date.today()
dates = [now+dt.timedelta(days=i) for i in range(n//2)+range(m,m+n//2)]
x = np.arange(n)
array2 = np.random.random(n)
fig, ax = plt.subplots()
ax.plot(x, array2, 'ro')
locs = x
labels = [d.strftime('%b %d') for d in dates]
plt.xticks(locs, labels)
plt.xticks(rotation=45)
plt.show()
產量
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.