求助！ 关于ode45
 

我的微分方程很简单，但不知道为什么老告诉我错误！请高手指点！
定义函数：
Function dy=concentraction(t,y,a,b,c,d)
dy=a*y+b*(y-c)/(d+t);
求解：
clear
ts=0:1:3000;
n=length(ts);
x0=[6];
a=1;
b=1;
c=1;
d=1;
opt=odeset('RelTol',1e-6,'AbsTol',1e-9);
ode45(@concentraction,ts,x0,opt,a,b,c,d);
错误提示：
Warning: feval on script names will not work, or may work differently,
in a future version of MATLAB. To make your code insensitive to any change
and to suppress this warning message:
- Either change the script to a function.
- Or use eval instead of feval.
The script file in question is concentraction.
> In funfun\private\odearguments at 110
In ode45 at 173
In diffsolve at 10
??? Attempt to execute SCRIPT concentraction as a function:
C:\Documents and Settings\xltp5\My Documents\MATLAB\P+S+B\concentraction.m

Error in ==> funfun\private\odearguments at 110
f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.

Error in ==> ode45 at 173
[neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, odeFcn, ...

Error in ==> diffsolve at 10
ode45(@concentraction,ts,x0,opt,a,b,c,d);

请高手指点！不胜感激！

:biggrin: [SIZE="4"] 我运行了，你有个特别小的问题
[COLOR="Red"] Function [/COLOR] 这个地方弄错了 ，应该是 [COLOR="red"] function [/COLOR]
那个函数应该是这样的
function dy=concentraction(t,y,a,b,c,d)
dy=a*y+b*(y-c)/(d+t);
并且 function dy 之间只有一个空格不是两个 [/SIZE]