variable mentioned but still getting unrecognized variable error

2 次查看（过去 30 天）
Ayush Ranjan
Ayush Ranjan 2023-7-17
编辑： Voss 2023-7-17
I am unrecognized variable where I have mentioned and declared variable,
p=zeros(7,1);
kpm = 10; kp =3;kmp = 14;klm = 15;kl = 1;theta=1;w=0.5;
p(1)=kpm;
p(2)=kp;
p(3)=kmp;
p(4)=klm;
p(5)=kl;
p(6)=theta;
p(7)=w;
tspan = 0:25;
yo=[0.2 0.05 0.539];
[t,y]=ode45(@(t,y)kumaretal2004new(t,y,p),tspan,yo);
for i=1:3
figure(i)
plot(t,y(:,i))
hold on
end
yexpected=zeros(26,3);
yexpected=table2array(Book65);
lb=zeros(7,1);
ub(1)=30;
ub(2)=30;
ub(3)=30;
ub(4)=30;
ub(5)=30;
ub(6)=30;
ub(7)=30;
A = [];
b = [];
Aeq = [];
beq = [];
parameters=fmincon(objectivefunction,p,A,b,Aeq,beq,lb,ub);
function dydt=kumaretal2004new(t,y,p)
dydt=zeros(3,1);
function qz=f(m)
qz=1+tanh((m-p(6))/p(7));
end
dydt(1)=(p(2))*y(1)*(1-y(1))-p(1)*y(1)*y(2);
dydt(2)=(p(3)*y(1)+y(3))*y(2)*(1-y(2))-y(2);
dydt(3)=p(4)*f(y(2))-p(5)*y(3);
end
function difference=objectivefunction(J)
tspan = 0:25;
N=size(tspan,2);
J=0;
for j=1:N
difference(j,1)=yexpected(j,1)-y(j,1);
difference(j,2)=yexpected(j,2)-y(j,2);
difference(j,3)=yexpected(j,3)-y(j,3);
J1=difference(j,1)^2;
J2=difference(j,2)^2;
J3=difference(j,3)^2;
J=J+J1+J2+J3;
end
end
  2 个评论
Stephen23
Stephen23 2023-7-17
This line of code:
parameters=fmincon(objectivefunction,p,A,b,Aeq,beq,lb,ub);
% ^^^^^^^^^^^^^^^^^
calls OBJECTIVEFUNCTION without any input arguments. It does NOT provide FMINCON with a function handle, as the FMINCON documentation states the 1st input must be. Solution: provide the 1st input as a function handle:
Note that you will need to parameterize the function to pass the variable YEXPECTED (and possibly others), just as the FMINCON documentation states near the top of the page:
https://www.mathworks.com/help/optim/ug/passing-extra-parameters.html

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回答（2 个）

Satwik Samayamantry
Hi Ayush,
Your code will throw the following error
Unrecognized function or variable 'Book65'.
Error in file1 (line 19)
yexpected=table2array(Book65);
This clearly indicates that you didn't declare the variable Book65. Hence, declare the variable before using it.
  3 个评论
显示 1更早的评论
Dyuman Joshi
Dyuman Joshi 2023-7-17
Where? How?
What is the error you get? Copy and paste the full error message i.e. all of the red text.
Ayush Ranjan
Ayush Ranjan 2023-7-17
I get the following error.
Unrecognized function or variable 'yexpected'.
Error in optimizertrial>objectivefunction (line 49)
difference(j,1)=yexpected(j,1)-y(j,1);
Error in optimizertrial (line 33)
parameters=fmincon(objectivefunction,p,A,b,Aeq,beq,lb,ub);
>>

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Voss
Voss 2023-7-17
编辑：Voss 2023-7-17
yexpected is defined in the main script (i.e., the base workspace), but not in the function objectivefunction, where it is used.
https://www.mathworks.com/help/matlab/matlab_prog/base-and-function-workspaces.html

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