点除 ./ 不是 /a=0.1;b=-0.1;r=20.1;e=2.71828;t=0:0.01:10;y=1./(1-r./(a+b*e.^(r*t)));plot(t,y,'*r')
a=0.1;b=-0.1;r=20.1;e=2.71828;t=0:1:100;y=1./(1-r./(a+b*e.^(r*t)));plot(t,y,'*r')
