python - fsolve on python(将matlab代码转换为python代码)

Question

我在 matlab 上有一个程序，但我想在 python 中转换，我的 matlab 代码是:

function [f]=equation1(x)
%options = optimoptions('fsolve','TolFun',1.1e-20,'TolX',1.1e-20,'maxIter',Inf,'MaxFunEvals',Inf);
c = 330 ;%speed of sound meters per second 
% unknown variable : 
% r1 => x(1) 
% theta => x(2)

time2 = 0.455; % Microphone 1 to Microphone 2 time delay
time3 = 0.606; % Microphone 1 to Microphone 3 time delay
% gives : 
r2 = 150 %time2*c;
r3 = 200 %time3*c; 

r4 = 499.1; % Distance from Microphone 2 to Microphone 3
r5 = 1267.9;% Distance from Microphone 1 to Microphone 3

phi = 16.177; % Angle between Microphone 1 and Microphone 2 measured from Microphone 3
 %
f(1)= (x(1) + r2)^2- (x(1)+r3)^2 -r4^2 +2*(x(1)+r3)*r4*cosd(x(2));
f(2)= x(1)^2  - (x(1)+r3)^2  - r5^2 + 2*(x(1)+r3)*r5*cosd(x(2)-phi);

我用 [x,feval]=fsolve(@equation1,[100 10]) 播放这段代码；他返回物有所值 ( 1620.7 076.4)但是在 python 上我已经制作了这个程序

from scipy.optimize import fsolve
import math

def  cosd(x):
    return math.cos(x * math.pi / 180);


def equations(p):
    time2 = 0.455 # Microphone 1 to Microphone 2 time delay
    time3 = 0.606 # Microphone 1 to Microphone 3 time delay
    # gives : 
    r2 = 150. #time2*c;
    r3 = 200. #time3*c; 

    r4 = 499.1  # Distance from Microphone 2 to Microphone 3
    r5 = 1267.9 # Distance from Microphone 1 to Microphone 3

    phi = 16.177 # Angle between Microphone 1 and Microphone 2 measured from Microphone 3
        r1, theta = p
    f1 = (r1 + r2)**2. -(r1+r3)**2 -r4**2 +2*(r1+r3)*r4*(cosd(theta))
    f2 = r1**2  - (r1+r3)**2  - r5**2 + 2*(theta+r3)*r5*(cosd(theta-phi))
        return (f1,f2)

x, y =  fsolve(equations, (1000.0, 20.0), xtol=1e-06, maxfev=10000000)

print x,y, equations((x, y))

但是当我运行时，我有一个错误的错误值:

迭代没有取得很好的进展，通过 从最近五次雅可比评估中得到改进。 warnings.warn(消息，RuntimeWarning)(-167792.68841940007, -1096453.7938717711)

有人说为什么它在 python 上不起作用吗？

编辑 => 我更改了学位问题的 python 代码。但是我没有好的值(value)，(python返回-4263.77780373 -272.257364385，它与matlab的值(value)相去甚远)。

Answer 1

我认为问题在于这个减法:

(theta-phi)

在 matlab 中，您要减去度数，但在 python 中，theta 的单位是 dregrees，而 phi 的单位是弧度。