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NDSolve::ndfdmc NDSolveValue::ndfdmc ParametricNDSolve::ndfdmc ParametricNDSolveValue::ndfdmc

NDSolve::ndfdmc NDSolveValue::ndfdmc ParametricNDSolve::ndfdmc ParametricNDSolveValue::ndfdmc

Details

  • This message is generated when the equations for the derivatives give values with list structures that are not equivalent to the lists used in specifying the initial conditions.
  • Off[message] switches off the message; On[message] switches it on. For example: Off[NDSolve::ndfdmc].

Examples

Basic Examples  (2)

An error occurs because the initial conditions are specified using lists and the equation for the derivatives gives scalar values for the derivatives:

Wolfram Language code: NDSolve[{x''[t] + x[t].x[t] == 0, x[0] == {0, 1}, x'[0] == {1, 0}}, x, {t, 0, 1}]

This is fixed by using a vector on the right-hand side of the equation:

Wolfram Language code: NDSolve[{x''[t] + x[t].x[t] == {0, 0}, x[0] == {0, 1}, x'[0] == {1, 0}}, x, {t, 0, 1}]

The dimensions of each equation need to match the dimensions of the corresponding derivatives:

Wolfram Language code: NDSolveValue[{x'[t] == y[t], y'[t] == {-x[t]}, x[0] == 1, y[0] == 0}, x[t] + y[t], {t, 0, π}]

This is fixed by eliminating the List from the equation for y':

Wolfram Language code: NDSolveValue[{x'[t] == y[t], y'[t] == -x[t], x[0] == 1, y[0] == 0}, x[t] + y[t], {t, 0, π}]