求解微分方程时遇到这种情况怎么办

张家谔

M,K为常数对角矩阵，T为常数
A,B为时间函数矩阵
用matlab能否求出其数值解？
{X(t-T)}应该怎么处理

无水1324

help dde23

：

DDE23  Solve delay differential equations (DDEs) with constant delays.
    SOL = DDE23(DDEFUN,LAGS,HISTORY,TSPAN) integrates a system of DDEs
    y'(t) = f(t,y(t),y(t - tau_1),...,y(t - tau_k)). The constant, positive
    delays tau_1,...,tau_k are input as the vector LAGS. DDEFUN is a function
    handle. DDEFUN(T,Y,Z) must return a column vector corresponding to
    f(t,y(t),y(t - tau_1),...,y(t - tau_k)). In the call to DDEFUN, a scalar T
    is the current t, a column vector Y approximates y(t), and a column Z(:,j)
    approximates y(t - tau_j) for delay tau_j = LAGS(J).  The DDEs are
    integrated from T0=TSPAN(1) to TF=TSPAN(end) where T0 < TF. The solution
    at t <= T0 is specified by HISTORY in one of three ways: HISTORY can be
    a function handle, where for a scalar T, HISTORY(T) returns a column
    vector y(t). If y(t) is constant, HISTORY can be this column vector.
    If this call to DDE23 continues a previous integration to T0, HISTORY
    can be the solution SOL from that call.

张家谔

非常感谢无水1324
正在学习中