??? Undefined function or variable 'ODE45_main'.

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Lan
Lan 2015-3-13
编辑： John D'Errico 2015-3-13
A case of matlab :
ODE45_fun.m function dy=ODE45_fun(t,y) a=1;b=1;c=9;
dy(1)=-a*y(1)+y(3)*y(2); dy(2)=-b*(y(1)+y(3)); dy(3)=c*y(2)-y(3)-3*y(2)*y(1);
dx=[dx(1);dx(2);dx(3)];
and ODE45_main.m
tspan=[0,100]; y0=[0;0;10^(-10)]; [t,y]=ode45('ODE45_fun',tspan,y0); data=[t,y]; save ODE45_data.txt data-ascii plot3(y(:,1),y(:,2),y(:,2)) grid on title('Lorenz 方程')
>> ODE45_main
Now： ??? Undefined function or variable 'ODE45_main'.

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John D'Errico
John D'Errico 2015-3-13
编辑：John D'Errico 2015-3-13
The obvious questions apply here.
1. Did you save it as an m-file?
2. On your search path?
3. Where on your search path?
Please do this:
which ODE45_main
Note that too often, the answer to the last question is the person has saved the function into the MATLAB directories. Bad idea.

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