MATLAB: bnb20 (Branch and Bound Method) Optimization - matlab

Question

I've got an error when running the following code in matlab. I'm trying to use bnb20.
function [errmsg,Z,X,t,c,fail] = optimize_bnb_test
P = [34336 701 227 2860 32841 463 616 39769 331 1224 1515 472583
1021 969 9260 39380 4986 6567 3386 16926 4841 100635];
C = 31300;
A = [-C 0 0; 0 -C 0; 0 0 -C;];
B =[-P(1); -P(2); -P(3);];
function y = linear_objective(n)
y = [1, 1, 1] * n;
end
lb = [1; 1; 1;];
ub = [16; 16; 16; ];
[errmsg,Z,X,t,c,fail] = BNB20('linear_objective',lb,[],lb,ub,A,B,
[],[],[],[],[],[]);
end
I got an error message like 'fun cause error.'
I don't know why.
I'm just learning matlab.
Update:
function [errmsg,Z,X,t,c,fail] = optimize_bnb_test
P = [34336 701 227 2860 32841 463 616 39769 331 1224 1515 472583 1021 969 9260 39380 4986 6567 3386 16926 4841 100635];
C = 31300;
A = [-C 0 0; 0 -C 0; 0 0 -C;];
B =[-P(1); -P(2); -P(3);];
lb = [1; 1; 1;];
ub = [16; 16; 16;];
fun = #(x)x(1)+x(2)+x(3);
[errmsg,Z,X,t,c,fail] = BNB20('fun',lb,[],lb,ub,A,B,[],[],[],[],[]);
end
Error message is changed:
I don't know what to do now..

Answer 1

The error happens the following call:
eval(['z=',fun,'(x0,varargin{:});'],'errmsg=''fun caused error.''; evalreturn=1;');
My guess is that varargin{:} is giving an error to your function. It looks like you don't use it, it is empty. I would try either of:
1.- delete the last ,[] from the call to bnb20 as the 13th input argument is optional, instead of giving an empty array ([]), just don't give anything.
2.- When you define your function to evaluate, define it with extra input arguments but dump then (or just do not use them).
function y = linear_objective(n,varargin)
y = [1, 1, 1] * n;
end