Labels dont show up

Question

MC 2019-9-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/481800-labels-dont-show-up

编辑： Shubham Gupta 2019-9-24

Hello,

Why does only the label for the last curve shows up? How do I get the labels to all show up on the same plot? I am graphing 3 different Euler's approximations and then an exact solution for an ODE on the same plot. Also how do I label the axis ?

f = @(t,y) t*y-y;
y0 = 0.5;
t = 0:0.2:1;
[t,y1] = euler(f,t,y0);
plot(t,y1)
legend('Euler 0.2')
hold on 
t = 0:0.1:1;
[t,y3] = euler(f,t,y0);
plot(t,y3)
legend('Euler 0.1')
t = 0:0.05:1;
[t,y4] = euler(f,t,y0);
plot(t,y4)
legend('Euler 0.05')
[t,y2] = ode45(f,[0 10],y0);
plot(t,y2,'LineWidth',3)
legend('Exact solution')

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Answer 1

Shubham Gupta 2019-9-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/481800-labels-dont-show-up#answer_393229

编辑：Shubham Gupta 2019-9-24

在 MATLAB Online 中打开

One way to do this :

f = @(t,y) t*y-y;
y0 = 0.5;
t = 0:0.2:1;
[t,y1] = euler(f,t,y0);
plot(t,y1,'DisplayName','Euler 0.2');
hold on
t = 0:0.1:1;
[t,y3] = euler(f,t,y0);
plot(t,y3,'DisplayName','Euler 0.1');
t = 0:0.05:1;
[t,y4] = euler(f,t,y0);
plot(t,y4,'DisplayName','Euler 0.05');
[t,y2] = ode45(f,[0 10],y0);
plot(t,y2,'LineWidth',3,'DisplayName','Exact solution');
legend show