python - 类型错误 : function() takes exactly 2 arguments (1 given) (python)

Question

import numpy as np
import scipy.optimize as spo

def function(x,y):
    return (np.sin(x*y+y)*np.exp(-1*(x**2+y**2)))**-1


xi=[0,0]    
answer=spo.fmin(function,xi)
print 'the answer is', answer

我正在尝试最小化此功能。但是运行它会出现

TypeError: function() takes exactly 2 arguments (1 given)

Answer 1

scipy.optimize.fmin(func, x0, args=(), xtol=0.0001, ftol=0.0001, maxiter=None, maxfun=None, full_output=0, disp=1, retall=0, callback=None)

参数func是可调用的func(x,*args)

在这种情况下，fmin 使用一个参数调用 function - x(即 xi)。第二个参数必须作为 args 参数传递。

xi = 0
args = (0,)
answer = spo.fmin(function, x0=xi, args=args)

http://docs.scipy.org/doc/scipy-0.16.0/reference/generated/scipy.optimize.fmin.html