Failure in initial objective function evaluation. FSOLVE cannot continue.
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Hi all,
I'm trying to solve a non linear, parametric system of equations.
Here my myfun_driver.m file containing the call to the function with fsolve:
fun = @root7d;
x0 = [0,0];
x = fsolve(fun,x0);
Here the root7d.m file where I defined the function and parameters (the main function has a call to othe functions, I don't know if I'm doing well):
%parameters
Vp=100;
Kp=0.5;
q=1;
phi=0.006;
MIN=1;
N1=10;
gb=0.8;
gp=0.45;
g1=0.6;
g2=0.5;
g3=0.6;
gf=0.75;
arb=1-ar;
ar=0.2;
r1=0.8;
eps2=0.02;
rho = @(x,vp,kp,gp,gb,MIN,N1)( (1-gp)* vp*x(1)/(kp+x(1))...
+ (1-gb)* (MIN*exp(x(1)/N1)*x(2)));
G1 = @(x,ar,eps2)((ar*x(2)+(1-ar)*x(2))/(eps2^2 + (ar*x(2)+(1-ar)*x(2))^2));
function F = root7d(x,vp,kp,q,phi,r1,MIN,N1,gb,ar,arb)
F(1) = -vp*x(1)/(kp+x(1))*q*x(2) +q*rho(x,gp,gb) + phi - r1*MIN*exp(x(1)/N1)*x(2);
F(2) = gb*r1*MIN*exp(x(1)/N1)*x(2) - r1*G1(x,ar)*arb*x(2)/(ar*x(2)+(1-ar)*x(2));
end
I don't know why I obtain the following message: Failure in initial objective function evaluation. FSOLVE cannot continue.
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Risposta accettata
Torsten
il 3 Ott 2022
Modificato: Torsten
il 3 Ott 2022
fun = @root7d;
x0 = [10,10];
x = fsolve(fun,x0)
fun(x)
function F = root7d(x)
%parameters
vp=100;
kp=0.5;
q=1;
phi=0.006;
MIN=1;
N1=10;
gb=0.8;
gp=0.45;
g1=0.6;
g2=0.5;
g3=0.6;
gf=0.75;
ar=0.2;
arb=1-ar;
r1=0.8;
eps2=0.02;
rho = ( (1-gp)* vp*x(1)/(kp+x(1)) + (1-gb)* (MIN*exp(x(1)/N1)*x(2)));
G1 = ((ar*x(2)+(1-ar)*x(2))/(eps2^2 + (ar*x(2)+(1-ar)*x(2))^2));
F(1) = -vp*x(1)/(kp+x(1))*q*x(2) +q*rho + phi - r1*MIN*exp(x(1)/N1)*x(2);
F(2) = gb*r1*MIN*exp(x(1)/N1)*x(2) - r1*G1*arb*x(2)/(ar*x(2)+(1-ar)*x(2));
end
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