t=0:0.5:400;
E=(-1.8211493173039+t)/(-0.761615638979534-0.0363464946617634*t.^2)+13.9096844667938;
T=t;
figure;
plot(T,E);
grid
t=0:0.5:400;
E=(-1.8211493173039+t)/(-0.761615638979534-0.0363464946617634*t.^2)+13.9096844667938;
T=t;
figure;
plot(T,E);
grid on%%grid 后面要加on
运行后显示的图为: