Attempted to access x(10); index out of bounds because numel(x)=2.
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Hello, I'm trying to solve a non linear optimization problem. And I get this error. I have no idea what is happening.
objfun:
function f = objfun(x)
f = 76500*x(1)*x(2);
confun:
function [c, ceq] = confun(x)
% Nonlinear inequality constraints
c = [0.0075-x(1)*x(2)^2; 0.000066425-x(1)*x(2)^3; 0.04-x(10); x(1)-0.12; 0.06-x(2);
x(2)-0.2; x(1)-x(2)];
% Nonlinear equality constraints
ceq = [];
Command Window:
>> x0=[0.04 0.060];
>> options = optimoptions(@fmincon,'Algorithm','sqp');
>> [x,fval] = fmincon(@objfun,x0,[],[],[],[],[],[],@confun,options);
output
Attempted to access x(10); index out of bounds because numel(x)=2.
Error in confun (line 3)
c = [0.0075-x(1)*x(2)^2; 0.000066425-x(1)*x(2)^3; 0.04-x(10); x(1)-0.12; 0.06-x(2);
Error in fmincon (line 651)
[ctmp,ceqtmp] = feval(confcn{3},X,varargin{:});
Caused by: Failure in initial user-supplied nonlinear constraint function evaluation. FMINCON cannot continue.
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Answers (1)
Geoff Hayes
on 17 Jan 2015
Kaushik - your confun function is defined as
function [c, ceq] = confun(x)
% Nonlinear inequality constraints
c = [0.0075-x(1)*x(2)^2; 0.000066425-x(1)*x(2)^3; 0.04-x(10); x(1)-0.12; 0.06-x(2); ...
x(2)-0.2; x(1)-x(2)];
% Nonlinear equality constraints
ceq = [];
Note how in all cases except one, you reference x(1) or x(2). Do you really mean to use x(10)? The error message is telling you that your input vector x has only two elements, yet third element of c is initialized using x(10). Is this intentional or is it a typo and should be x(1) instead?
2 Comments
Geoff Hayes
on 18 Jan 2015
There must be a different error message if you changed the x(10) to x(1). Please copy and paste the full error message to this thread.
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