作业帮matlab求解泛函微分方程数值解.我想用matlab求解一个泛函微分方程的数值解,编了个程序总是运行不出来,lags=[1]; sol=dde23('ddefun',lags,'history',[0,100]); plot(sol.x,sol.y); title('ddefun');xlabel('t');ylabel('y'); l
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/29 02:33:54
![matlab求解泛函微分方程数值解.我想用matlab求解一个泛函微分方程的数值解,编了个程序总是运行不出来,lags=[1]; sol=dde23('ddefun',lags,'history',[0,100]); plot(sol.x,sol.y); title('ddefun');xlabel('t');ylabel('y'); l](/uploads/image/z/13962653-53-3.jpg?t=matlab%E6%B1%82%E8%A7%A3%E6%B3%9B%E5%87%BD%E5%BE%AE%E5%88%86%E6%96%B9%E7%A8%8B%E6%95%B0%E5%80%BC%E8%A7%A3.%E6%88%91%E6%83%B3%E7%94%A8matlab%E6%B1%82%E8%A7%A3%E4%B8%80%E4%B8%AA%E6%B3%9B%E5%87%BD%E5%BE%AE%E5%88%86%E6%96%B9%E7%A8%8B%E7%9A%84%E6%95%B0%E5%80%BC%E8%A7%A3%2C%E7%BC%96%E4%BA%86%E4%B8%AA%E7%A8%8B%E5%BA%8F%E6%80%BB%E6%98%AF%E8%BF%90%E8%A1%8C%E4%B8%8D%E5%87%BA%E6%9D%A5%2Clags%3D%5B1%5D%3B+sol%3Ddde23%28%27ddefun%27%2Clags%2C%27history%27%2C%5B0%2C100%5D%29%3B+plot%28sol.x%2Csol.y%29%3B+title%28%27ddefun%27%29%3Bxlabel%28%27t%27%29%3Bylabel%28%27y%27%29%3B+l)
matlab求解泛函微分方程数值解.我想用matlab求解一个泛函微分方程的数值解,编了个程序总是运行不出来,lags=[1]; sol=dde23('ddefun',lags,'history',[0,100]); plot(sol.x,sol.y); title('ddefun');xlabel('t');ylabel('y'); l
matlab求解泛函微分方程数值解.
我想用matlab求解一个泛函微分方程的数值解,编了个程序总是运行不出来,
lags=[1];
sol=dde23('ddefun',lags,'history',[0,100]);
plot(sol.x,sol.y);
title('ddefun');xlabel('t');ylabel('y');
legend('y_1','y_2','y_3','y_4',2);
tx=[4.3,4.7];y=deval(sol,tx);hold on;plot(tx,y,'x');
function dydt=ddefun(t,y,Z)
ylag1=Z(:,1);
dydt=[(-0.5)*y(1)-2*y(2)+ylag1(3)
2*y(1)-0.5*y(2)+ylag1(4)
(-0.5)*y(3)-0.5*y(4)+ylag1(1)
0.5*y(3)-0.5*y(4)+ylag1(2)];
function S=history(t)
S=ones(3,1);
原方程是这样的
dy1/dt=-0.5y1-2y2+y3(t-1)
dy2/dt=2y1-0.5y2+y4(t-1)
dy3/dt=-0.5y3-0.5y4+y1(t-1)
dy4/dt=0.5y3-0.5y4+y2(t-1)
还是不对，运行后出现了这样的提示：
In an assignment A(:,matrix) = B,the number of rows in A and B
must be the same.
Error in ==> C:\MATLAB6.5\toolbox\matlab\funfun\dde23.m (lagvals)
On line 656 ==> Z(:,j) = temp(:);
Error in ==> C:\MATLAB6.5\toolbox\matlab\funfun\dde23.m
On line 270 ==> Z = lagvals(t,lags,history,t,y,[],varargin{:});
matlab求解泛函微分方程数值解.我想用matlab求解一个泛函微分方程的数值解,编了个程序总是运行不出来,lags=[1]; sol=dde23('ddefun',lags,'history',[0,100]); plot(sol.x,sol.y); title('ddefun');xlabel('t');ylabel('y'); l
改动：
function S=history(t)
S=ones(3,1);
改为 S=ones(4,1);
OVER!
PS.多翻翻help!