Why do I receive legend error in matlab

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Kamar Ledgister
Kamar Ledgister 2020-9-6
评论： Star Strider 2020-9-6
close all;
clear all;
clc
m=10;
b=5;
k=100;
F=100;
timerange=[0 20];
initialvalues=[0 0];
[t, x]=ode45(@second_order1,timerange,initialvalues);
figure
plot(t,x(:,1),'LineWidth',2)
ylabel('position(m),velocity(m/s),acceleration(m/s^2)')
xlabel('time(s)')
hold on
plot(t,x(:,2),'LineWidth',2,'LineStyle','-.')
hold on
plot(t,F/m-(b/m)*x(:,2)-(k/m)*x(:,1),'LineWidth',2,'LineStyle',':')
legend ('Position','Velocity','Acceleration')

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回答（1 个）

Star Strider
Star Strider 2020-9-6
I cannot run yuour code, since I get:
Unrecognized function or variable 'second_order1'.
What is the error you are seeing?
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Star Strider
Star Strider 2020-9-6
My pleasure!
If my Answer helped you solve your problem, please Accept it!
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