import matplotlib.pyplot as plt
import numpy as np

x = np.arange(-3.14, 3.14, 0.02)

y = np.sin(x) + x * x / 2 - 1

plt.plot(x, y)

plt.show()

for i in range(0, len(y) - 1):
    if y[i] >-0.01 and y[i] <0.01:
        print(x[i])

问题解决的话，请点采纳

import  numpy as np
import  matplotlib.pyplot as plt


x=np.linspace(-np.pi,np.pi,1000)
y=np.sin(x)+x**2/2.0-1


e=0.0001   #set error range
roots=[]
for i in range(len(x)-1):
    if np.sign(y[i]) != np.sign(y[i+1]):
        roots.append(find_root(x[i],x[i+1],e))


plt.plot(x,y)
plt.show()

import  numpy as np
import  matplotlib.pyplot as plt


def function(x):
    return np.sin(x)+x**2/2.0-1

def find_root(a,b,e):
    y1=function(a)
    y2=function(b)
    if np.abs(y1)<=e or np.abs( y2)<=e:
        return a if np.abs(y1)<np.abs(y2) else b
    c=(a+b)/2.0
    y3=function(c)
    if np.sign(y1)==np.sign(y3):
        return find_root(c,b,e)
    else:
        return find_root(a,c,e)

x=np.linspace(-np.pi,np.pi,1000)
y=function(x)


e=0.0001   #set error range
roots=[]
for i in range(len(x)-1):
    if np.sign(y[i]) != np.sign(y[i+1]):
        roots.append(find_root(x[i],x[i+1],e))


plt.plot(x,y)
plt.title("root:"+str(roots))
print("root:  ",roots)
plt.show()

总是被恶意举报，牛逼你提供更好的答案出来，别整这些没用的！！！