我希望使用scipy来优化以下公式,并添加x [0] - x [1] > 0的约束条件。在将该表达式打印到目标函数中时,它也会给出负值,但优化以成功结束。最终目标是最小化sqrt(0.1 * x [0] * x [1]),由于数学错误而失败。
import numpy as np
from scipy.optimize import minimize
def f(x):
print x[0] - x[1]
#return sqrt(0.1*x[0]*x[1])
return 0.1*x[0]*x[1]
def ineq_constraint(x):
return x[0] - x[1]
con = {'type': 'ineq', 'fun': ineq_constraint}
x0 = [1, 1]
res = minimize(f, x0, method='SLSQP', constraints=con)
print res
并且输出:
0.0
0.0
1.49011611938e-08
-1.49011611938e-08
0.0
0.0
1.49011611938e-08
-1.49011611938e-08
0.0
0.0
1.49011611938e-08
-1.49011611938e-08
4.65661176285e-10
4.65661176285e-10
1.53668223701e-08
-1.44355000176e-08
fun: 1.7509862319755833e-18
jac: array([ 3.95812066e-10, 4.42378184e-10, 0.00000000e+00])
message: 'Optimization terminated successfully.'
nfev: 16
nit: 4
njev: 4
status: 0
success: True
x: array([ 4.42378184e-09, 3.95812066e-09])
x[0] - x[1] >= 0
有什么问题? - sascha