How do I input a time dependent variable from one function to fsolve function equations?

Question

Agrim Singh 2021-6-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/847400-how-do-i-input-a-time-dependent-variable-from-one-function-to-fsolve-function-equations

回答： Walter Roberson 2021-6-3

function F = A_U_G(x)
    a = 2360000000;
    b = 1610000000;
    c = 700000;
    d = 4640000000;
    F(1) = x(1) - (u/b) + (b*x(2)); % qAmm
    F(2) = x(2) - ((u/c)*(c/(c + d))); % qUrd
    F(3) = x(3) - (u/Yd) - (x(1)*t); % qGln
end

Above is the fsolve function

x0 = [0,0,0];
x = fsolve('A_U_G',x0);
qA = x(1); 
qU = x(2);
qG = x(3);

Above is the call

Now in the same function where call is made for fsolve function lies variable u, t that changes with time after each iteration.

And I want them to also change their values in function F. So, what changes need to be done?

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Answer 1

Walter Roberson 2021-6-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/847400-how-do-i-input-a-time-dependent-variable-from-one-function-to-fsolve-function-equations#answer_716300

在 MATLAB Online 中打开

u = randn();
x0 = [0,0,0];
x = fsolve( @(x) A_U_G(x,u), x0);
Unrecognized function or variable 'Yd'.

Error in solution>A_U_G (line 16)
    F(3) = x(3) - (u/Yd) - (x(1)*t); % qGln

Error in solution (line 4)
x = fsolve( @(x) A_U_G(x,u), x0);

Error in fsolve (line 260)
            fuser = feval(funfcn{3},x,varargin{:});

Caused by:
    Failure in initial objective function evaluation. FSOLVE cannot continue.
qA = x(1); 
qU = x(2);
qG = x(3);
function F = A_U_G(x, u)
    a = 2360000000;
    b = 1610000000;
    c = 700000;
    d = 4640000000;
    F(1) = x(1) - (u/b) + (b*x(2)); % qAmm
    F(2) = x(2) - ((u/c)*(c/(c + d))); % qUrd
    F(3) = x(3) - (u/Yd) - (x(1)*t); % qGln
end