>> H=[20.26 26.14 40.87 -24.86;26.14 81.31 109.52 -204.57;40.87 109.52 192.65 -406.49;-24.86 -204.57 -406.49 4577.63];
>> f=zeros(1,4);
>> A=[0 -1.31 -3.72 -10.75;0 1 1 0];
>> b=[-5.66;0.5];
>> Aeq=[1 1 1 1];
>> beq=1;
>> lb=[0.2;0.2;0;0];
>> ub=[1;1;0.3;0.2];
>> x=quadprog(H,f,A,b,Aeq,beq,lb,ub)
Warning: Large-scale method does not currently solve this problem formulation,switching to medium-scale method.> In quadprog at 236Exiting: the constraints are overly stringent; no feasible starting point found.