问题描述
我是Matlab新手。我希望你能帮助我。
我必须使用ODE45函数来解决一个ODE系统。
函数dNdt = rateEquations(t,y)
%相应的群体状态
Ng = y(1);
Ns = y(2);
Nt = y(3);
%为便于阅读,所使用的所有常量均被删除。
记下参数F.
%速率方程
dNs = s0 * Ng * F - Ns / t_S1;
dNt = Ns / t_ISC - Nt / t_T1;
dNg = -dNt - dNs;
dNdt = [dNg; DNS; DNT];
end
然后,在我的脚本.m文件中,我打电话给ode45函数在'for循环'中。在每次迭代中,我必须更改参数F并将其传递给我的'rateEquations'函数。但我不知道如何实现它。
对于T = Tmin:dt:Tmax
%初始条件
initialConditions = [N0 0 0];
timeSpan = [T T + dt];
在调用ODE45之前F将被更改。
[t,N] = ode45('rateEquations',timeSpan,initialConditions)
等等...
end
预先感谢您。 code> F 您的派生函数的参数,并将正确的匿名函数传递给 ode45
:
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I'm new with Matlab. I hope you can help me.I have to solve a system of ODEs using ODE45 function. Here is the function which describes my equitions.
function dNdt = rateEquations(t, y)
%populations of corresponding state
Ng = y(1);
Ns = y(2);
Nt = y(3);
%All constants used are dropped for the sake of easy reading.
Note the parameter F.
%rate equations
dNs = s0 * Ng * F - Ns/ t_S1;
dNt = Ns / t_ISC - Nt / t_T1;
dNg = -dNt - dNs;
dNdt = [dNg; dNs; dNt];
end
Then, in my script .m-file i call the ode45 function in 'for loop'. During each iteration i have to change the parameter F and pass it to my 'rateEquations' - function. But i don't know how to realize it.
for T = Tmin: dt : Tmax
%initial conditions
initialConditions = [N0 0 0];
timeSpan = [T T+dt];
before calling ODE45 F is to be changed.
[t,N] = ode45('rateEquations', timeSpan, initialConditions)
and so on ...
end
Thanks in advance.
You want make F
an argument of your derivative function and pass the right anonymous function to ode45
:
[t,N] = ode45(@(t,y) rateEquations(t,y,F), timeSpan, initialConditions)
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