计算常微分方程 出错原因
 

我建立了一个函数文件 保存在work中
function f=fun3(x,y)
f=[-2*y+2*x.^2+2*x]
end
然后进行了如下调用
[x,y]=ode23('fun3',[0,0.5],1)
??? Error using ==> feval
Undefined function or method 'fun3' for input arguments of type 'double'.

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

Error in ==> ode23 at 172
[neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, odeFcn, ...

计算常微分方程，但是却一直出错。
请高手帮忙，谢谢！

回复: 计算常微分方程 出错原因
 

可以运行啊
f =

-2


f =

-1.8792


f =

-1.8254


f =

-1.7662


f =

-1.6227


f =

-1.5607


f =

-1.4905


f =

-1.3557


f =

-1.2975


f =

-1.2315


f =

-1.1047


f =

-1.0499


f =

-0.9877


f =

-0.8681


f =

-0.8163


f =

-0.7575


f =

-0.6444


f =

-0.5954


f =

-0.5398


f =

-0.4325


f =

-0.3860


f =

-0.3332


f =

-0.2313


f =

-0.1870


f =

-0.1368


f =

-0.0397


f =

0.0025


f =

0.0505


f =

0.1432


f =

0.1836


f =

0.2294


f =

0.2470


f =

0.2555


f =

0.2643


x =

0
0.0400
0.0900
0.1400
0.1900
0.2400
0.2900
0.3400
0.3900
0.4400
0.4900
0.5000


y =

1.0000
0.9247
0.8434
0.7754
0.7199
0.6764
0.6440
0.6222
0.6105
0.6084
0.6154
0.6179