I have this script to plot the solution to damped oscillator but when i run it it says undefined function or variable. What am I missing?

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Zivile Dailidonyte 2018-10-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/425079-i-have-this-script-to-plot-the-solution-to-damped-oscillator-but-when-i-run-it-it-says-undefined-fun

编辑： madhan ravi 2018-10-20

function yp=forced(t,y)
yp=[y(2);((0.56*sin(3.7*t))-(0.78*y(2))-(14*y(1)))];
tspan=[0 5];
y0=[0,0];
[t,y]=ode45(@(t,y) forced(t,y), tspan,y0);
plot(t,y(:,1));
grid on
xlabel('time')
ylabel('displacement')
title('displacement vs time')
end

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采纳的回答

madhan ravi 2018-10-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/425079-i-have-this-script-to-plot-the-solution-to-damped-oscillator-but-when-i-run-it-it-says-undefined-fun#answer_342393

编辑：madhan ravi 2018-10-20

在 MATLAB Online 中打开

Screen Shot 2018-10-20 at 5.00.56 PM.png

%SCRIPT FILE

tspan=[0 5]; 
y0=[0,0]; 
[t,y]=ode45(@forced, tspan,y0); 
plot(t,y(:,1));
grid on 
xlabel('time') 
ylabel('displacement') 
title('displacement vs time')

%FUNCTION FILE:

function yp=forced(t,y) 
yp=[y(2);((0.56*sin(3.7*t))-(0.78*y(2))-(14*y(1)))]; 
end

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Zivile Dailidonyte 2018-10-20

That is exactly what I need but still when I run it it says undefined function or variable. Even though I created separate function file and the script with all the inputs.