python – 填充两个函数之间的区域

发布时间：2020-12-20 11:42:16 所属栏目：Python 来源：网络整理

导读：import matplotlib.pyplot as pltimport numpy as npdef domain(): x = np.arange(0,10,0.001) f1 = lambda x: (2*x - x**2)**0.5 plt.plot(x,f1(x),label = '$y = sqrt{2x - x^2}$') plt.plot(f1(x),x,label = '$x = sqrt{2y - y^2}$') plt.xlabel('X') p

import matplotlib.pyplot as plt
import numpy as np

def domain():
    x = np.arange(0,10,0.001)

    f1 = lambda x: (2*x - x**2)**0.5
    plt.plot(x,f1(x),label = '$y = sqrt{2x - x^2}$')
    plt.plot(f1(x),x,label = '$x = sqrt{2y - y^2}$')
    plt.xlabel('X')
    plt.ylabel('Y')
    plt.legend(loc='best')


    axes = plt.gca()
    axes.set_xlim([0,5])
    axes.set_ylim([0,5])
    plt.show()

domain()

如何利用fill_between()填充2条线之间的区域？换句话说,我怎样才能在绿线和蓝线之间填充小花瓣？

解决方法

@user 5061在代码上是正确的,反函数在那里

import matplotlib.pyplot as plt
import numpy as np

def domain():
    x = np.arange(0,0.001)

    f1 = lambda x: (2*x - x**2)**0.5
    f2 = lambda x: 1 - (1-x*x)**0.5 # other part is f2 = lambda x: 1 + (1-x*x)**0.5
    plt.plot(x,label = '$x = sqrt{2y - y^2}$')
    plt.fill_between(x,f2(x),where=f1(x)>=f2(x),interpolate=True,color='yellow')
    plt.xlabel('X')
    plt.ylabel('Y')
    plt.legend(loc='best')


    axes = plt.gca()
    axes.set_xlim([0,5])
    plt.show()

domain()

不取正分量1(1-x * x)** 0.5,因为它不影响交点.

（编辑：李大同）

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