Solving System ODE with ode45

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Donrad
Donrad 2016-11-30
评论： Donrad 2016-11-30
Hi All, I'm trying to solve a system ODE with ode45. I get this error for my code:
Error in ode45 (line 115) odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);
Any help is appreciated. I have attached the m.files
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bio lim
bio lim 2016-11-30
I don't see your .m files.
Donrad
Donrad 2016-11-30
Whoops. Files are now attached, thanks for the heads up.

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bio lim
bio lim 2016-11-30
编辑：bio lim 2016-11-30
With first look, in your function, there are many undefined variables, that are X0, y0, z0, and Ap0.
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bio lim
bio lim 2016-11-30
I see. Defining unnecessary variables is the first thing you should avoid.
You have defined:
Tg=1;
Tr=2;
ProInh2=3;
HGlnInh=4;
Inh=5;
TrTg=6;
p2_Tr=7;
and then:
x0(Tg)=1;
x0(Tr)=1;
x0(ProInh2)=0;
x0(HGlnInh)=1;
x0(Inh)=0;
x0(TrTg)=1;
x0(p2_Tr)=0;
These are simple things you should avoid. Just set x0(1) = 1, or even better x0 = [1 . . . ], and make a comment saying the first element of your initial condition is Tg. Declaring many variables like this makes your program look very complicated and tiring to look at, especially for debugging. For example, when I was looking at your function definition, I had hard time following it due to the number of variables, and which index is being manipulated in your operations.
Donrad
Donrad 2016-11-30
Yeah, I used the proper I.Cs:
x0(Tg)=0.167;
x0(Tr)=0.0002;
x0(ProInh2)=1.5;
x0(HGlnInh)=0;
x0(Inh)=.278;
x0(TrTg)=0;
x0(p2_Tr)=0;
But no solution so far. I agree I have to code efficiently.

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