Failure in initial objective function evaluation. FSOLVE cannot continue.
2 views (last 30 days)
Show older comments
i set two files as main.m and root.m.
Here are my codes.
When I runs main.m,it keeps telling me that "Failure in initial objective function evaluation. FSOLVE cannot continue."
Hope someone can help me with that.Thanks!
[main.m]
clear all; clc
fun = @root;
x0 = [2e-5,0.04,0.1524,1.0194,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
x = fsolve(fun,x0)
[root.m]
global Tinlet Treact T0
Tinlet = 273+25 ;%K
Treact = 273+150 ;%K
T0 = 273+25;%K
global ki1 ki2 kp11 kp12 kp21 kp22 ktal kd ki10 kp110 kp120 kp210 kp220 ktal0 kd0 Eki1 Ekp11 Ekp12 Ekp21 Ekp22 Ektal Ekd R
R = 8.314;
ki10 = 13.0;
Eki1 = 10000;
ki1 = ki10 * exp(-Eki1*(1/Treact-1/T0));
ki2 = 0.0;
kp110 = 3.70e+05;
Ekp11 = 10000;
kp11 = kp110 * exp(-Ekp11*(1/Treact-1/T0));
kp120 = 673;
Ekp12 = 10000;
kp12 = kp120 * exp(-Ekp12*(1/Treact-1/T0));
kp210 = 1.36e+03;
Ekp21 = 10000;
kp21 = kp210 * exp(-Ekp21*(1/Treact-1/T0));
kp220 = 46 ;
Ekp22 = 10000;
kp22 = kp220 * exp(-Ekp22*(1/Treact-1/T0));
ktal0 = 2.5;
Ektal = 10000;
ktal = ktal0 * exp(-Ektal*(1/Treact-1/T0));
kd0 = 1.0e-04;
Ekd = 10000;
kd = kd0 * exp(-Ekd*(1/Treact-1/T0));
function F = fun(x)
F(1) =ktx(2)*x(5)+x(6)*x(2)-ki1*x(1)*x(3)-ki2*x(1)*x(4)-x(14);
F(2) =UDSI0 - x(14)*stoptime-x(1);
F(3) =ktx(2)*x(2)*(x(6)+x(7))-x(15);
F(4) =UDSI1 - x(15)*stoptime-x(2);
F(5) =(ki1*x(1)+kp11*x(5)+kp21*x(6))*x(3)-x(16);
F(6) =UDSI2 - x(16)*stoptime-x(3);
F(7) =(ki2*x(1)+kp12*x(5)+kp22*x(6))*x(4)-x(17);
F(8) =UDSI3 - x(17)*stoptime-x(4);
F(9) =ki1*x(1)*x(3)+kp21*x(6)*x(3)-kp12*x(5)*x(4)-(ktx(2)*x(2)+kd)*x(5)-x(18);
F(10) =UDSI4 - x(18)*stoptime-x(5);
F(11) =ki2*x(1)*x(4)+kp12*x(5)*x(4)-kp21*x(6)*x(3)-(ktx(2)*x(2)+kd)*x(6)-x(19);
F(12) =UDSI5 - x(19)*stoptime-x(6);
F(13) =ki1*x(1)*x(3)+kp11*x(5)*x(3)+kp21*(x(7)+x(6))*x(3)-kp12*x(7)*x(4)-(ktx(2)*x(2)+kd)*x(7)-x(20);
F(14) =UDSI6 - x(20)*stoptime-x(7);
F(15) =ki2*x(1)*x(4)+kp22*x(6)*x(4)+kp12*(first_lamada2+x(5))*x(4)-kp21*x(7)*x(3)-(ktx(2)*x(2)+kd)*first_lamada2-x(21) ;
F(16) =UDSI7 - x(21)*stoptime-x(8);
F(17) =ki1*x(1)*x(3)+kp11*(2*x(7)+x(5))*x(3)+kp21*(x(10)+2*x(8)+x(6))*x(3)-kp12*x(9)*x(4)-(ktx(2)*x(2)+kd)*x(9)-x(22);
F(18) =UDSI8 - x(22)*stoptime-x(9);
F(19) =ki2*x(1)*x(4)+kp22*(2*x(8)+x(6))*x(4)+kp12*(x(9)+2*x(7)+x(5))*x(4)-kp21*x(10)*x(3)-(ktx(2)*x(2)+kd)*x(10)-x(23);
F(20) =UDSI9 - x(23)*stoptime-x(10);
F(21) =(ktx(2)*x(2)+kd)*(x(5)+x(6))-x(24);
F(22) =UDSI10 - x(24)*stoptime-x(11);
F(23) =(ktx(2)*x(2)+kd)*(x(7)+x(8))-x(25);
F(24) =UDSI11 - x(25)*stoptime-x(12);
F(25) =(ktx(2)*x(2)+kd)*(x(9)+x(10))-x(26);
F(26) =UDSI12 - x(25)*stoptime-x(13);
F = [F(1),F(2),F(3),F(4),F(5),F(6),F(7),F(8),F(9),F(10),F(11),F(12),F(13),F(14),F(15),F(16),F(17),F(18),F(19),F(20),F(21),F(22),F(23),F(24),F(25),F(26)];
end
5 Comments
Accepted Answer
Jan
on 27 Apr 2022
You provide a handle to a script. This cannot work, because fsolve expects a function handle. Most likely you want:
fsolve(@fcn, x0)
instead. Currently the constants are not visible in the function fcn. Maybe you want to declare the variables as globals there also? What is stoptime?
Whenever you mention an error in the forum, paste a copy of the complete error message, not just some parts of it.
0 Comments
More Answers (1)
See Also
Categories
Find more on Logical in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!