Plot multiple subintervals in one figure
显示 更早的评论
Hello all. Probably quite an easy problem but I am stuck.
f=@(t,u)-u+sin(5*t)+cos(2*t);
a=0; b=5; ua=2; % begynnelsevillkor
t=linspace(a,b,15); u=linspace(-2,2,15);
riktningsfaelt(f,t,u);
N=10; h=(b-a)/N; %steglängd
T=linspace(a,b,N+1); U=zeros(size(T));
U(2)=ua; %enligt begynnelsevillkor
for n=1:N
U(n+1)=U(n)+h*f(T(n),U(n)); % Eulers metod
end
plot(T,U)
So what I want to do is plot but with different N values in the same figure. I have tried "hold on" then set a new N value but it doesn't work. Lets say I want to plot N=10 and N=100 in the same figure, how do I do that??
2 个评论
Rik
2017-11-9
You did run the plot command another time after the hold on?
Joakim Karlsson
2017-11-10
采纳的回答
Mischa Kim
2017-11-10
编辑：Mischa Kim
2017-11-10
Joakim, is this what you had in mind?
f=@(t,u)-u+sin(5*t)+cos(2*t);
a=0; b=5; ua=2; % begynnelsevillkor
t=linspace(a,b,15); u=linspace(-2,2,15);
% riktningsfaelt(f,t,u);
for N = 10:10:100
h=(b-a)/N; %steglängd
T=linspace(a,b,N+1);
U=zeros(size(T));
U(2)=ua; %enligt begynnelsevillkor
for n=1:N
U(n+1)=U(n)+h*f(T(n),U(n)); % Eulers metod
end
plot(T,U)
hold on
end
4 个评论
Joakim Karlsson
2017-11-10
编辑：Joakim Karlsson
2017-11-10
Mischa Kim
2017-11-10
编辑：Mischa Kim
2017-11-10
Simple enough. Replace the for command by
for N = [10,100,1000]
The code in my first answer above creates essentially the same graph, just with 10 plots vs 3.
Joakim Karlsson
2017-11-10
Rik
2017-11-11
Save the handles to the line objects (output of plot function) and you can set the color. (or just use a cell array with the color string inside the for-loop)
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Annotations 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
