清空筛选条件
清空筛选条件

2nd Order Diff Equation

2 次查看（过去 30 天）
bugatti79
bugatti79 2014-7-15
评论： Star Strider 2014-7-15
Hi Folks,
I get the following error when I attempt to run this bit of code
"Maximum recursion limit of 500 reached. Use set(0,'RecursionLimit',N) to change the limit. Be aware that exceeding your available stack space can crash MATLAB and/or your computer.
Error in ode45 "
function yp = unforced1(t,y)
m=1;
k=100;
%s=.1;
c=2*m*0.1*(k/m)^(1/2);
y(2)=0 ;
y(1)=0.02;
yp = [y(2);(-((c/m)*y(2))-((k/m)*y(1)))];
tspan=0:0.01:4;
y0=[0.02;0];
[t,y]=ode45('unforced1',tspan,y0);
plot(t,y(:,1));
grid on
xlabel('time')
ylabel('Displacement')
title('Displacement Vs Time')
hold on;
end
Any ideas? Regards Bugatti

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2014-7-15
You are calling ode45 inside your ODE function. This is likely the reason for the recursion limit warning.
Delete the function statement at the start, change the yp line to be an anonymous function:
unforced1 = @(t,y) [y(2);(-((c/m)*y(2))-((k/m)*y(1)))];
and change the call to ode45 to:
[t,y]=ode45(unforced1,tspan,y0);
When I made those changes it worked for me without errors (R2014a).
  6 个评论
显示 4更早的评论
bugatti79
bugatti79 2014-7-15
Ah ok! Great, thanks for your help. Appreciated.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Programming 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by