将y轴设置为百万 [英] set y-axis in millions

问题描述

我对这个情节有疑问:

[！[在此处输入图片描述] [1]] [1]

[![enter image description here][1]][1]

y轴为单位，但我需要以百万为单位:

The y-axis is in unit but I need them to be in millions as such:

[！[在此处输入图片描述] [2]] [2]

[![enter image description here][2]][2]

您知道实现此目标的方法吗?预先感谢.

Do you know a method to achieve this? Thanks in advance.

推荐答案

您可以像这样使用自定义FuncFormatter:

You can use a custom FuncFormatter like this:

from matplotlib.ticker import FuncFormatter
import matplotlib.pyplot as plt
def millions(x, pos):
    'The two args are the value and tick position'
    return '%1.1fM' % (x * 1e-6)


formatter = FuncFormatter(millions)

fig, ax = plt.subplots()
ax.yaxis.set_major_formatter(formatter)

或者您甚至可以用以下功能替换数百万个以支持所有大小:

Or you can even replace millions with the following functions to support all magnitudes:

def human_format(num, pos):
    magnitude = 0
    while abs(num) >= 1000:
        magnitude += 1
        num /= 1000.0
    # add more suffixes if you need them
    return '%.2f%s' % (num, ['', 'K', 'M', 'G', 'T', 'P'][magnitude])

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