x=[1,2,3,4,5,6,7,8,9,10,20,30];
y1=[2.1177,2.7428,3.0877,3.2612,3.3472,3.4298,3.5241,3.5681,3.5964,3.6174,3.7560,3.7899];
plot(x,y1)
hold on
y2=[3.4491,4.9309,5.9981,6.4075,6.6011,6.7730,6.9885,7.1010,7.2006,7.3069,7.6129,7.6546];
plot(x,y2)
hold on
y3=[5.0124,7.7014,9.5183,10.5682,11.1156,11.5987,11.9483,12.1547,12.3633,12.5237,13.0893,13.3259];
plot(x,y3)
hold on
y4=[6.6068,10.7773,13.7736,15.5987,16.5676,17.2934,17.7721,18.1088,18.3576,18.5360,19.2798,19.4907];
plot(x,y4),grid on
xlabel('發射天線數nT');
ylabel('容量/(bit/s/Hz)');