How to marker a fplot(anonymous function) function on a specific point which user enters.

Question

Khashayar Asadi 2021-8-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1439874-how-to-marker-a-fplot-anonymous-function-function-on-a-specific-point-which-user-enters

评论： Khashayar Asadi 2021-8-24

Hello, I wrote a function which needs a (t) as input and it graphs something i want to marker the point which user inputs on the graph for example if user defines t=10 I want to marker the graph on point t=10 and x(t)=10. how should I do that. here is my code

    function x=calcDisplacement(t)
    m=1100;
    k=570;
    c=430;
    x0=0.05;
    v0=0;
    omega_d = sqrt((4*m*k)-(c^2))/(2*m);
    sigma = c/(2*m);
    alpha = x0/2;
    beta = -((v0+x0)/(2*(omega_d)));
    displacement=@(t) 2*exp(-2*(sigma).*t).*(((alpha)*cos((omega_d).*t))-(beta)*sin((omega_d).*t));
    x=displacement(t);
    fplot(displacement,[0 50],'color','blue')
    ylim([-0.1 0.1])
    legend ('Displacement of suspension')
    ylabel('Displacement(m)')
    xlabel('Time(s)')
    title('Graph of displacement in car suspension')
    hold on;
 
end

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Answer 1

Turlough Hughes 2021-8-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1439874-how-to-marker-a-fplot-anonymous-function-function-on-a-specific-point-which-user-enters#answer_773619

编辑：Turlough Hughes 2021-8-24

在 MATLAB Online 中打开

You can add it in at the end of your function using plot:

function x=calcDisplacement(t)
m=1100;
k=570;
c=430;
x0=0.05;
v0=0;
omega_d = sqrt((4*m*k)-(c^2))/(2*m);
sigma = c/(2*m);
alpha = x0/2;
beta = -((v0+x0)/(2*(omega_d)));
displacement=@(t) 2*exp(-2*(sigma).*t).*(((alpha)*cos((omega_d).*t))-(beta)*sin((omega_d).*t));
x=displacement(t);
fplot(displacement,[0 50],'color','blue')
ylim([-0.1 0.1])
ylabel('Displacement(m)')
xlabel('Time(s)')
title('Graph of displacement in car suspension')
hold on;
plot(t,x,'ok','LineWidth',2)
legend ('Displacement of suspension','point of interest')
end