How to smoothen the following plot in matlab?

Question

marya 2017-5-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/340789-how-to-smoothen-the-following-plot-in-matlab

回答： 10B 2017-5-26

I used the following code to plot the figure below

function dydt = model (t,y)
  dydt = zeros (size(y));
  Ah=0.000051;Av=0.071;b1=0.071;b2=0.091;g=0.0035;
  d1=0.0000043;d2=0.04;e1=0.001;w=0.11; 
  Sh=y(1);
  Ih=y(2);
  Rh=y(3);
  Sv=y(4);
  Iv=y(5);
  Nh = Sh+Ih+Rh; 
  %The model
  dydt(1) = Ah - b1*Iv*Sh/Nh +w*Rh - d1*Sh;
  dydt(2) = b1*Iv*Sh/Nh - (g  + e1 + d1)*Ih;
  dydt(3) = g*Ih - (w +d1)*Rh;
  dydt(4) = Av - b2*Ih*Sv/Nh - d2*Sv;
  dydt(5) = b2*Ih*Sv/Nh - d2*Iv;
  %The basic reproduction number for the model
  R0 = sqrt((b1*b2*Av*d2)/(Ah*(d2^2)*(g + e1+ d1)));
  disp(R0)
end
    % plot
    tspan = [0 10000];
    y0 = [3600 1000 100 9600 400];
    [t,y] = ode45(@model,tspan,y0);
    plot(t,y(:,1),'b',t,y(:,2),'r',t,y(:,3),'g','Linewidth',3)
    title('Plot of human population against time')
    xlabel('Time(years)')
    ylabel('Number of People')
    legend('Susceptible ','Infectious','Recoverd' ,2)

As you can see the curves are not smooth enough. How can I smooth the curves further?

3 个评论
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Tina 2017-5-18

In what way the curves are not smooth enough? To me it seems only due to the resolution of the plot.

Guillaume 2017-5-18

@KSSV, marya original formatting was very confusing as she'd conflated the ode function with the script that uses it. All the information was there. I've edited her post.

@Maria, I agree with Tina, the plots look very smooth, so you'll have to explain better what improvements you want.

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