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Mathematica Version 5 help

  1. Dec 6, 2004 #1
    This mathematica code works for version 4 but i can't get it to work in version 5. Does anybody have any sugestions.

    F = {Fx, Fy, Fz};
    r = {x[t], y[t], z[t]};
    EF = {Ex, Ey, Ez};
    BF = {Bx, By, Bz};
    v = D[r, t]

    F = q EF + q Cross[v, BF]

    eq1 = F - m D[r, {t, 2}] == 0 // Thread;
    eq1 // ColumnForm

    initial = {
    x[0] == 0, x'[0] == 0,
    y[0] == 0, y'[0] == 0,
    z[0] == 0, z'[0] == 0};

    fields = Thread /@ {BF -> {0, 0, m ω0/
    q}, EF -> {E0 Cos[ω t], 0, 0}} // Flatten

    eqs = Join[eq1, initial] /. fields

    dsol = DSolve[eqs, {x[t], y[t], z[t]}, t] // Flatten // FullSimplify
    when i do this last part i get this message

    DSolve::bvnul: "For some branches of the general solution, the given boundary \
    conditions lead to an empty solution.

    Thanks!
     
  2. jcsd
  3. Dec 6, 2004 #2
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