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杨小薇

铜虫 (小有名气)

[求助] 代码运行出现错误,希望有高手指导 已有1人参与

tspan = [0,3600];%变量求解区间
y0 = [1 1];%初值
a=2;b=2;c=5;d=2;e=6;f=2;g=8;h=4;li=4;lj=6;l=3;m=55;n=3;p=9;q=11;r=13;k=5;l=6;m=5;n=5;p=4.6;q=0.56;
DyDtAnony = @(a,b,c,d,e,f,g,h,li,lj,k,l,m,n,p,q,r)@(t,y)[a*y(2)*(b-y(1));
(c*(a*y(2)*(b-y(1))+d*(a*y(2)*(b-y(1)))*(e-y(2))+f*(e-y(6)))/(f*y(1)));
(c*(a*y(2)*(b-y(1))+g*(a*y(2)*(b-y(1)))*(y(3)-h)+li*(lj-y(7))));
((a*y(2)*(b-y(1))+k*(lj-y(8)+l*(y(4)-m)*(a*y(2)*(b-y(1)))))/(y(5)+1));
n-(a*y(2)*(b-y(1)));
y(6)-y(2)-p*(li-y(2));
y(7)-y(3)-q*(lj-y(3));
y(8)-y(4)-r*(n-y(4))];
tic;
[t15sAnony,y15sAnony] = ode15s(DyDtAnony,tspan,y0,options,a,b,c,d,e,f,g,h,li,lj,k,l,m,n,p,q,r);
time15sAnony = toc;
disp(['ode15s计算点数(匿名函数表示微分方程)::',num2str(length(t15sAnony)),...
    ';所用时间:',num2str(time15sAnony),'s.'])


错误信息是,输入太多参数
Error using
@(a,b,c,d,e,f,g,h,li,lj,k,l,m,n,p,q,r)@(t,y)[a*y(2)*(b-y(1));(c*(a*y(2)*(b-y(1))+d*(a*y(2)*(b-y(1)))*(e-y(2))+f*(e-y(6)))/(f*y(1)));(c*(a*y(2)*(b-y(1))+g*(a*y(2)*(b-y(1)))*(y(3)-h)+li*(lj-y(7))));((a*y(2)*(b-y(1))+k*(lj-y(8)+l*(y(4)-m)*(a*y(2)*(b-y(1)))))/(y(5)+1));n-(a*y(2)*(b-y(1)));y(6)-y(2)-p*(li-y(2));y(7)-y(3)-q*(lj-y(3));y(8)-y(4)-r*(n-y(4))]
Too many input arguments.

Error in odearguments (line 88)
f0 = feval(ode,t0,y0,args{:});   % ODE15I sets args{1} to yp0.

Error in ode15s (line 149)
[neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, odeFcn, ...

Error in Untitled3 (line 13)
[t15sAnony,y15sAnony] =
ode15s(DyDtAnony,tspan,y0,options,a,b,c,d,e,f,g,h,li,lj,k,l,m,n,p,q,r);
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hppdyx

木虫 (知名作家)

【答案】应助回帖

1. a,b,c,d,e,f,g,h,li,lj,k,l,m,n,p,q,r不都是常数吗,为什么还要写成@(a,b,c,d,e,f,g,h,li,lj,k,l,m,n,p,q,r);
2. 待求解方程DyDtAnony的写法不能这么写,最好写到专门的m文件中;
3. ode15s中的options没有设置
不以风骚惊天下,但求淫荡动世人
2楼2014-03-15 10:45:58
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