清楚的
x1=linspace(0,0.1,10);
y 1 = polyval([-2.258 11.55-17.7 16.02],x 1);
x2 = Lin space(0.1.1.6,10);
y2 = polyval([-1.8064 9.24-14.16 12.816],x2);
x3=linspace(1.6,3,10);
y3 = polyval([0.9904 e-3 9.24-0.12504 1.9336 3.5848],x3);
x4=linspace(3,74,100);
y4=1.8*exp(1.53e-4。*x4。^2-0.0305.* x4+2.952);
x5=linspace(74,100,100);
y5=13.9*10。^(-0.003.* X5);
繪圖(x1,y1,x2,y2,x3,y3,x4,y4,x5,y5)
按照上面的說法試試。