Unrecognized function or variable 'x0'.

[x,fval]=fsolve(@newmintafun1,x0,options)

When i run the command for the code attached, i'm given an error message "Unrecognized function or variable 'x0'"

Kindly spare a moment to check it out for me. Thank you.

[Image Analyst]

Wasn't this essentially solved here: https://www.mathworks.com/matlabcentral/answers/1973964-unrecognized-function-or-variable-x0#answer_1245444

[Bismark]

Yes i couldn't locate the page for the answers that's why i asked again and copied the url to keep. Thank you

Answer 1

[Matt J]

Relocate the last 2 lines from newmintafun1 and make x0 the correct length.

x0 = [10; 6; 4; 3; 4; 3; 2; 3; 18; 7; 25; 10; 5; 5; 4; 11; 8; 20; 30; 7; 2; 6; 14; 30];

options = optimset('Display','iter')   
[x,fval]=fsolve(@newmintafun1,x0,options)

function F = newmintafun1(x)
    F =[x(5)/x(12) - ((0.5*(1-0.08)*x(1))/0.349*(1-0.2)*(1-x(4)));
    x(12)*(1 - 0.08)*x(1) + x(7) + x(8) + x(15)*x(17) - ((1 - 0.2)*x(5)*x(4)) - (x(10)*x(6))-((1+x(9))*x(8));
    x(12)*x(1)-(0.349*0.99*x(17)*x(15)/0.41*(1 - 0.08));
    1-(0.99*(x(10) +(1-0.1)));
    x(17)-((0.08 - 1)*x(18));
    x(6)-(1-0.1)*x(6)-x(7);
    x(15)-((1+0.1)*x(16));
    x(16)-(12*(x(13)/x(14)));
    x(1)-((1-0.8)^(1/0.667)*x(2)^((0.667-1)/0.667) + 0.8^(1/0.667)*x(3)^((0.667-1)/0.667))^(0.667/(0.667-1));
    x(2)-((1-0.8)*(x(13)/x(12))^(-0.667)*x(1));
    x(3)- (0.8*(x(14)/x(12))^(-0.667)*x(1));
    x(12)-(((1-0.8)*(x(13)^(1-0.667)) + 0.8*x(14)^(1-0.667)^(1/(1-0.667))));
    x(12)*x(1)-(x(14)*x(3))-(x(13)*x(2));
    x(20)-((x(6)^0.33)*(x(4)^0.349)*(x(19)^(1-0.33-0.349)));
    x(10)/x(12)-(0.33*(x(23)/x(6)));
    x(5)/x(12)-(0.349*(x(23)/x(4))); 
    x(19)- (x(13)/x(15)*(1-0.33-0.349)*x(23));
    x(18)-((1-0.08)*x(19));
    x(25)-(((1-5)*(1-5*0.99))/5*x(22)-0.33*0.99*x(25));
    x(9)-x(11) + x(25);
    x(22)-((x(13)/x(12))^(0.5)*0.2*5*x(10)^(0.33)*x(5)^(0.349)*x(15)^((1-0.33-0.349)));
    x(20)-x(1)-x(7)-x(23)-x(21);	
    x(23)+(1-x(9))*x(8)-0.08*x(1)-0.2*x(5)*x(4) - 0.08*x(18)-x(8);
    x(11) - 1/0.99 - 0.5*(x(24)-1)-0.5*(x(23)-4)];
%     x0 = [10; 6; 4; 3; 4; 3; 2; 3; 18; 7; 25; 10; 5; 5; 4; 11; 8; 20; 30; 7; 2; 6; 14; 30;]; 
% options = optimset('Display','iter')   

    
end

[Bismark]

This is what pops up when i run

"'fsolve' requires Optimization Toolbox.

Error in newmintafun1 (line 3)

[x,fval]= fsolve(@newmintafun,x0,options)"

How do i proceed from here sir?

[Matt J]

You cannot proceed unless you buy the Optimization Toolbox.

[Walter Roberson]

(Though there is a chance that you already own the Optimization Toolbox but have not installed it. Use the Add-On Explorer to search for the toolbox; it will tell you whether you already own it or not.)