type = 'max';
A =    [4 3; 4 1; 4 2];
sign = [-1 ; -1 ; -1 ];
h =    [12 ; 8  ; 8  ];
c = [3 4];

[z,x_B,index_B] = simplex (type,A,h,c,sign);
histogram([index_B x_B']')