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NDSolve::bcuns NDSolveValue::bcuns ParametricNDSolve::bcuns ParametricNDSolveValue::bcuns

NDSolve::bcuns NDSolveValue::bcuns ParametricNDSolve::bcuns ParametricNDSolveValue::bcuns

Details

  • This message is generated when the equations for the boundary conditions cannot be solved.
  • Off[message] switches off the message; On[message] switches it on. For example: Off[NDSolve::bcuns].

Examples

Basic Examples  (1)

An error is generated because one of the boundary conditions does not have a solution:

Wolfram Language code: NDSolve[{Derivative[2, 0][f][x, t] == Derivative[0, 2][f][x, t], f[1, t] == 1 + f[1, t], f[2, t] == 2, f[x, 0] == x, Derivative[0, 1][f][x, 0] == 0}, f, {x, 1, 2}, {t, 0, 1}]

is an impossible boundary condition to satisfy, so you get an error. An example of a correct boundary condition specification is the following:

Wolfram Language code: NDSolve[{Derivative[2, 0][f][x, t] == Derivative[0, 2][f][x, t], f[1, t] == 1, f[2, t] == 2, f[x, 0] == x, Derivative[0, 1][f][x, 0] == 0}, f, {x, 1, 2}, {t, 0, 1}]