用matlab编程最后结果显示为0，刚开始学习。

f=[5.26;1.90;5.89;0.64;4.42;5.19;0.99;5.61;1.76;3.86;4.21;1.90;5.61;1.27;3.72;4.00;1.13;4.56;1.83;3.16;2.95;1.27;3.51;2.74;2.25;2.74;2.25;3.65;2.60;2.81;2.46;1.48;2.46;4.21;0.78;1.90;2.04;2.46;3.72;1.62;0.64;3.09;1.06;5.05;1.27;1.27;3.51;0.57;6.10;0.50];
A=[1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1;
   0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0;
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0;
   -0.005,0,0,0,0,-0.025,0,0,0,0,-0.015,0,0,0,0,0.015,0,0,0,0,0.005,0,0,0,0,0.025,0,0,0,0,0.015,0,0,0,0,0.005,0,0,0,0,0.025,0,0,0,0,0.005,0,0,0,0;
   0,-0.005,0,0,0,0,-0.025,0,0,0,0,-0.015,0,0,0,0,0.015,0,0,0,0,0.005,0,0,0,0,0.025,0,0,0,0,0.015,0,0,0,0,0.005,0,0,0,0,0.025,0,0,0,0,0.005,0,0,0;
   0,0,0,0,-0.005,0,0,0,0,-0.025,0,0,0,0,-0.015,0,0,0,0,0.015,0,0,0,0,0.005,0,0,0,0,0.025,0,0,0,0,0.015,0,0,0,0,0.005,0,0,0,0,0.025,0,0,0,0,0.005;
   -0.015,0,0,0,0,0.005,0,0,0,0,-0.005,0,0,0,0,-0.035,0,0,0,0,-0.025,0,0,0,0,-0.045,0,0,0,0,-0.035,0,0,0,0,-0.025,0,0,0,0,-0.045,0,0,0,0,-0.025,0,0,0,0;
   0,-0.015,0,0,0,0,0.005,0,0,0,0,-0.005,0,0,0,0,-0.035,0,0,0,0,-0.025,0,0,0,0,-0.045,0,0,0,0,-0.035,0,0,0,0,-0.025,0,0,0,0,-0.045,0,0,0,0,-0.025,0,0,0;
   0,0,0,0,-0.015,0,0,0,0,0.005,0,0,0,0,-0.005,0,0,0,0,-0.035,0,0,0,0,-0.025,0,0,0,0,-0.045,0,0,0,0,-0.035,0,0,0,0,-0.025,0,0,0,0,-0.045,0,0,0,0,-0.025;
   eye(50,50);eye(50,50)];
B=[0.95;1.05;1.00;1.05;1.10;1.25;1.05;1.30;1.35;1.25;1.25;1.10;1.35;1.05;1.15;1.35;1.05;1.15;1.35;1.25;0;0;0;0;0;0;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;1.4784;
   2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464;2.464 ];
lb=zeros(50,1);
[x,fval]=linprog(f,A,B,[],[],lb);
x;
fval;

此题的最小解确实就是0向量，如果觉得解不对，要从边界条件lb和约束条件A,B上去分析，是不是这些条件给的不合适。