MATLAB: Fsolve Error! Need help- Using Fsolve to solve system of non-linear equations.

fsolve errorMATLAB

% ***Function script
cpa=1.005;
cpg=1.148;
Qin=801.4;
t2=401;
t1=294.11;
p1=101.4;
p2=2.5*p1;
px=p2;
p3=.94*px;
p5=p1;
nreg=.8;
nc=.82;
nt=.85;
function F=myfun(x)
F=[x(10)-cpa*(t2-t1);
    x(10)-cpg*(x(2)-x(3));
    x(9)-cpg*(x(3)-x(4));
    Qin-cpg*(x(2)-x(1));
    nreg*(x(4)-t2)-(x(1)-t2);
    nc*(t1-t2)-(t1-x(5));
    nt*(x(2)-x(6))-(x(2)-x(3));
    nt*(x(3)-x(7))-(x(3)-x(4));
    x(5)-(2.5^(.28571429)*t1);
    x(6)-((x(8)/p3)^(.24981245)*x(2));
    x(7)-(p5/x(8))^(.24981245)*x(3)];
end
% ****Solver Code
x0=[440;1000;900;850;380;890;800;160;110;110];
options = optimoptions('fsolve','display','iter');
[x,fval]= fsolve(@project2,x0,options);

Best Answer

Make the below changes in your code:
[x,fval]= fsolve(@(x)myfun(x,cpa,cpg,Qin,t2,t1,p1,p2,px,p3,p5,nreg,nc,nt),x0,options);
function F=myfun(x,cpa,cpg,Qin,t2,t1,p1,p2,px,p3,p5,nreg,nc,nt)
Note: You finally get a message that No solution found. Maybe it has something to do with the initial guess but this answer clears all the errors in your code. You would have to figure it out by yourself.
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