getting error , i want to solve 6 equation by fsolve

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mahaveer das 2018-12-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/435961-getting-error-i-want-to-solve-6-equation-by-fsolve

评论： madhan ravi 2018-12-16

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madhan ravi 2018-12-16

upload the code you try

mahaveer das 2018-12-16

在 MATLAB Online 中打开

function F= solar(x)
j=5.67e-8;
M=40;
Cp=4180;
f = 0.88;
L=1;
hci=100;
Aap=1.9;
od=0.03;
e=0.9;
Hab=500;
Tfi=40;
Ta=20;
W=1;
hw=67.83;
Q=x(1);
U=x(2);
hr=x(3);
Tr=x(4);
Tfm=x(5);
Tfo=x(6);
F(1) = Q-Aap*f*(Hab-(pi*od*U*(Tfi-Ta))/(W-od));
F(2) = U-hw-hr;
F(3) = hr-e*j*(Tr+Ta)*(Tr^2+Ta^2);
F(4) = (Tr-Tfm)*(hci*pi*od*L)-M*Cp*(Tfo-Tfi);
F(5) = 2*Tfm-Tfi-Tfo;
F(6) = M*Cp*(Tfo-Tfi)-Q;
end
in command window
 x0=[1;1;1;1;1;1];
>> xsol=fsolve(@(x) solar(x),x0)
Undefined function or variable 'cn'.
Error in fsolve (line 230)
           cn{3},x,var fuser = feval(funfargin{:});
Caused by:
    Failure in initial objective function evaluation. FSOLVE cannot
    continue.
 

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回答（2 个）

madhan ravi 2018-12-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/435961-getting-error-i-want-to-solve-6-equation-by-fsolve#answer_352616

编辑：madhan ravi 2018-12-16

在 MATLAB Online 中打开

x0=[1;1;1;1;1;1];
xsol=fsolve(@(x) solar(x),x0)   % function call
function F= solar(x)   % function definition
j=5.67e-8;
M=40;
Cp=4180;
f = 0.88;
L=1;
hci=100;
Aap=1.9;
od=0.03;
e=0.9;
Hab=500;
Tfi=40;
Ta=20;
W=1;
hw=67.83;
Q=x(1);
U=x(2);
hr=x(3);
Tr=x(4);
Tfm=x(5);
Tfo=x(6);
F(1) = Q-Aap*f*(Hab-(pi*od*U*(Tfi-Ta))/(W-od));
F(2) = U-hw-hr;
F(3) = hr-e*j*(Tr+Ta)*(Tr^2+Ta^2);
F(4) = (Tr-Tfm)*(hci*pi*od*L)-M*Cp*(Tfo-Tfi);
F(5) = 2*Tfm-Tfi-Tfo;
F(6) = M*Cp*(Tfo-Tfi)-Q;
end