###这是一个利用内置函数求最小值#####
def func(x):

    return x ** 2 - 2 *x

x = 1

func(x)

opt.fmin(func ,x)

## 用scipy求解线性方程组

from scipy.optimize import fsolve

from math import sin, cos

def f(x):

    x0 = float(x[0])

    x1 = float(x[1])

    x2 = float(x[2])

    return [5 * x1 + 3,

            4 * x0 * x0-2 * sin(x1 * x2),

            x1 * x2 -1.5]

def J(x):

    x0 = float(x[0])

    x1 = float(x[1])

    x2 = float(x[2])

    return[[0, 5, 0],

           [8 * x0, -2*x2*cos(x1*x2),-2*x1*cos(x1*x2)],

           [0, x2,x1]]

result = fsolve(f, [1,1,1],fprime = J)

print result

print f(result)