- #1

Nesrine

- 9

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I have tried to solve a system of differentiel equations with mathematica that is presented as follow

X[t_] = {x1[t], x2[t], x3[t], x4[t], x5[t], x6[t] , x7[t], x8[t],

x9[t], x10[t], x11[t], x12[t]};

system = MapThread[#1 == #2 &, {X'[t], A.X[t]}];

where the matrix A is periodic.

when I used NDSolve :

sol = NDSolve[{system,

x1[0] == x2[0] == x3[0] == x4[0] == x5[0] == x6[0] == x7[0] ==

x8[0] == x9[0] == x10[0] == x11[0] ==

x12[0] == {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}}, {x1, x2, x3, x4,

x5, x6, x7, x8, x9, x10, x11, x12}, {t, 0, T}];

I have got an error message that is :

NDSolve::ndfdmc: Computed derivatives do not have dimensionality consistent with the initial conditions. >>

Can someone please explain it to me??

Thank you very much