[英]Modification of horizontal bar plot in Pandas
我已經使用 Pandas plot
功能組合了一個plot
,但希望能幫助您使用以下元素完成它(如所需的輸出繪圖圖像所示):
OpenToLast
條形數據更加突出,因此如果可能的話,是否希望將其他堆疊的條形淡入背景?數據:
請在此處查看DataFrame.to_dict()
輸出。
這就是我獲得現有plot
:
auction[['OpenToLast','OpenToMaxHigh','OpenToMaxLow']].head(20).plot(kind='barh',
figsize=(7,10),
fontsize=10,
colormap ='winter',
stacked = True,
legend = True)
當前情節:
期望輸出:
請嘗試以下操作:
事實證明,最棘手的部分是着色,但繪制線條和更新刻度相對簡單(參見代碼末尾)
import numpy as np
# get the RGBA values from your chosen colormap ('winter')
winter = matplotlib.cm.winter
winter = winter(range(winter.N))
# select N elements from winter depending on the number of columns in your
# dataframe (make sure they are spaced evenly from the colormap so they are as
# distinct as possible)
winter = winter[np.linspace(0,len(winter)-1,auction.shape[1],dtype=int)]
# set the alpha value for the two rightmost columns
winter[1:,3] = 0.2 # 0.2 is a suggestion but feel free to play around with this value
new_winter = matplotlib.colors.ListedColormap(winter) # convert array back to a colormap
# plot with the new colormap
the_plot = auction[['OpenToLast','OpenToMaxHigh','OpenToMaxLow']].head(20).plot(kind='barh',
figsize=(7,10),
fontsize=10,
colormap = new_winter,
stacked = True,
legend = True)
the_plot.axvline(0,0,1) # vertical line at 0 on the x axis
start,end = the_plot.get_xlim() # find current span of the x axis
the_plot.xaxis.set_ticks(np.arange(start,end,10)) # reset the ticks on the x axis with increments of 10
我沒有意識到我可以直接通過 Matplotlib API 使用 Pandas plot
命令。 我現在已經復制了上面的代碼並修改為在 Matplotlib 中添加其他元素。
如果有人知道如何執行此操作,最好為條形添加漸變,但我會將這個問題標記為已回答:
import matplotlib.pyplot as plt
import matplotlib.ticker as ticker
cols = ['OpenToLast','OpenToMaxHigh','OpenToMaxLow']
colors = {'OpenToLast':'b', 'OpenToMaxHigh' : '#b885ea', 'OpenToMaxLow': '#8587ea'}
axnum = auction[cols].head(20).plot(kind='barh',
figsize=(7,10),
fontsize=10,
color=[colors[i] for i in cols],
stacked = True,
legend = True)
axnum.xaxis.set_major_locator(ticker.MultipleLocator(10))
plt.axvline(0, color='b')
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