How to plot this line and specified point

Question

RetiredCheetoXI 2022-2-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1643365-how-to-plot-this-line-and-specified-point

评论： Davide Masiello 2022-2-4

In addition to the point on the graph that shows up, I'd like to also have the line of the equation show up on the graph as well. I have tried using hold on and hold off and a couple other ways, but I cannot figure it out

prompt = 'Time of flight? (s) ';
t = input(prompt);
if (t <= 45)
    h = 15*t.^2;
    fprintf('Altitude: %dm\n\n', h) 
    v = 30*t;
    fprintf('Velocity: %dm/s\n\n', v);
    
    figure(1)
    subplot(2,1,1)
    plot(t, h, 'o'), xlabel('Time (s)'), ylabel('Altitude (m)'), title('Altitude vs Time')
    subplot(2,1,2)
    plot(t, v,'o'), xlabel('Time (s)'), ylabel('Velocity (m/s)'), title('Velocity vs Time')
    
    
elseif (t < 117.5)
    h = 30375 + (1350*t) + 0.5*(-11.5)*t.^2;
    fprintf('Altitude: %dm\n\n', h )     
    v = 1350 - 11.5*t;
    fprintf('Velocity: %dm/s\n\n', v);
    
    figure(2)
    subplot(2,1,1)
    plot(t, h,'o'), xlabel('Time (s)'), ylabel('Altitude (m)'), title('Altitude vs Time')
    subplot(2,1,2)
    plot(t, v,'o'), xlabel('Time (s)'), ylabel('Velocity (m/s)'), title('Velocity vs Time')
    
    
end

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Answer 1

Davide Masiello 2022-2-4

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1643365-how-to-plot-this-line-and-specified-point#answer_889130

在 MATLAB Online 中打开

prompt = 'Time of flight? (s) ';
t = input(prompt);
tx = t-5:t+5;
if (t <= 45)
    h = @(x) 15*x.^2;
    fprintf('Altitude: %dm\n\n', h(t)) 
    v = @(x) 30*x;
    fprintf('Velocity: %dm/s\n\n', v(t));
    
    figure(1)
    subplot(2,1,1)
    plot(t,h(t),'o',tx,h(tx)), xlabel('Time (s)'), ylabel('Altitude (m)'), title('Altitude vs Time')
    subplot(2,1,2)
    plot(t,v(t),'o',tx,v(tx)), xlabel('Time (s)'), ylabel('Velocity (m/s)'), title('Velocity vs Time')
        
elseif (t < 117.5)
    h = @(x) 30375 + (1350*x) + 0.5*(-11.5)*x.^2;
    fprintf('Altitude: %dm\n\n', h(t))     
    v = @(x) 1350 - 11.5*x;
    fprintf('Velocity: %dm/s\n\n', v(t));
    
    figure(2)
    subplot(2,1,1)
    plot(t,h(t),'o',tx,h(tx)), xlabel('Time (s)'), ylabel('Altitude (m)'), title('Altitude vs Time')
    subplot(2,1,2)
    plot(t,v(t),'o',tx,v(tx)), xlabel('Time (s)'), ylabel('Velocity (m/s)'), title('Velocity vs Time')
    
end