I am attempting to implement the fminunc (unconstrained Problem) function in MATLAB. I am getting an error with my code.

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Praveen Kumar
Praveen Kumar 2015-8-14
编辑： Walter Roberson 2015-8-17
Objective Function
function r = objfn(x)
x1 = x(1); x2 = x(2); %two design variables
n = size(x1);
for i = 1:n
r(i) = exp((-1.767767*(x1 - x1(i)).^2)+(-1.0511218*(x2-x2(i)).^2));
% this is my equation, where r is a vector matrix of order 25X1
end
a = r'
y = -0.0293 + (a*(G1)); %G1 is a matrix of order
fminunc
% bounds
Lb = [6; 12]; Ub = [8; 15];
x0 = [6.1; 13]; % initial value
x = fminunc(fun,x0)
when i execute i get this error
" Attempted to access x1(2); index is out of bounds because numel(x1) = 1"
I think i have an error in my loop, please help me to rectify it and get the solution, i am new to coding

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回答（1 个）

Alan Weiss
Alan Weiss 2015-8-17
Your code does not make much sense to me for the following reasons:
  • x1 and x2 are scalars. So what do you expect n to be?
  • Since x1 is a scalar, there is no x1(2), and that is the error you get. What did you want x1(2) to be?
  • Did you pass the matrix G1 to your objective function somehow, or is there a nested function that we cannot see?
I suggest that you put a breakpoint in your code and use the debugger.
Alan Weiss
MATLAB mathematical toolbox documentation

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