Why is this simple problem infeasible?

[Hantao Cui]

Hi Johan,

I'm trying to restrict binary variables in this way:

clear
bt = bt(2, 2);
stc = [bt(1,2) + bt(2, 1) == 1];
obj = 2*bt(1, 2) + bt(2, 1);
solvesdp(stc, obj)

Why is it infeasible with CPLEX? It seems that bt(1, 2) == 0 and bt(2, 1) == 1 could be a feasible solution.

Thanks for your help in advance.

[Hantao Cui]

Sorry, I had a typo while shortening the variable name.

Please copy the code from here:

clear
bt = binvar(2, 2);

[Johan Löfberg]

Note red text
http://users.isy.liu.se/johanl/yalmip/pmwiki.php?n=Tutorials.Basics

[Hantao Cui]

Sorry for my ignorance... Thanks a lot!