www.gusucode.com > 关于海航matlab和lingo的训练题 > mySum2.m
%mySum求和 function s=mySum(s) f(1)=1.5;%传染 g(1)=650;%未传染 r(1)=1;%免疫 for i=1:99 f(i+1)=0.05+f(i)*20*+g(i)*0.6*0.8 g(i+1)=g(i)-g(i)*0.6*0.8 r(i+1)=r(i)+g(i)*0.4*0.8 end i=1:100; plot(i,f,'ro') figure(2) plot(i,g,'go') figure(3) plot(i,r,'ko')