python【大數據分析】Scipy（04）

安裝

sudo pip install scipy

 應用

from scipy.optimize import fsolve

# 求解非線性方程組和數值積分
# 求解2x1-x2^2=1,x1^2-x2=2
def f(x):
    x1 = x[0]
    x2 = x[1]
    return [2*x1-x2**2-1,x1**2-x2-2]

result = fsolve(f,[1,1])
print(result)

 

from scipy import integrate

# 數值積分
def g(x):
    return (1-x**2)**0.5
pi_2,err=integrate.quad(g,-1,1)
print(pi_2*2)