条形图上用值注释条形

条形图上用值注释条形

本文介绍了在 Pandas 条形图上用值注释条形的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我一直在寻找一种方法,用我的 DataFrame 中的舍入数值来注释 Pandas 条形图中的条形.

>>>df=pd.DataFrame({'A':np.random.rand(2),'B':np.random.rand(2)},index=['value1','value2'])>>>df甲乙值 1 0.440922 0.911800值 2 0.588242 0.797366

我想得到这样的东西:

我尝试使用此代码示例,但注释都以 x 刻度为中心:

>>>ax = df.plot(kind='bar')>>>对于 idx,enumerate(list(df.index)) 中的标签:对于 df.columns 中的 acc:值 = np.round(df.ix[idx][acc],decimals=2)ax.annotate(值,(idx, 值),xytext=(0, 15),textcoords='偏移点')
解决方案

您可以直接从轴的补丁中获取它:

for p in ax.patches:ax.annotate(str(p.get_height()), (p.get_x() * 1.005, p.get_height() * 1.005))

您需要调整字符串格式和偏移量以使内容居中,也许可以使用 p.get_width() 中的宽度,但这应该会让您开始.除非您在某处跟踪偏移量,否则它可能不适用于堆叠条形图.

I was looking for a way to annotate my bars in a Pandas bar plot with the rounded numerical values from my DataFrame.

>>> df=pd.DataFrame({'A':np.random.rand(2),'B':np.random.rand(2)},index=['value1','value2'] )
>>> df
                 A         B
  value1  0.440922  0.911800
  value2  0.588242  0.797366

I would like to get something like this:

I tried with this code sample, but the annotations are all centered on the x ticks:

>>> ax = df.plot(kind='bar')
>>> for idx, label in enumerate(list(df.index)):
        for acc in df.columns:
            value = np.round(df.ix[idx][acc],decimals=2)
            ax.annotate(value,
                        (idx, value),
                         xytext=(0, 15),
                         textcoords='offset points')
解决方案

You get it directly from the axes' patches:

for p in ax.patches:
    ax.annotate(str(p.get_height()), (p.get_x() * 1.005, p.get_height() * 1.005))

You'll want to tweak the string formatting and the offsets to get things centered, maybe use the width from p.get_width(), but that should get you started. It may not work with stacked bar plots unless you track the offsets somewhere.

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08-11 14:20