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NDSolve::bcnop NDSolveValue::bcnop ParametricNDSolve::bcnop ParametricNDSolveValue::bcnop NDEigensystem::bcnop NDEigenvalues::bcnop

NDSolve::bcnop NDSolveValue::bcnop ParametricNDSolve::bcnop ParametricNDSolveValue::bcnop NDEigensystem::bcnop NDEigenvalues::bcnop

Details

  • This message is generated when the position of a boundary condition is not on the boundary of the region specified.
  • This problem can usually be resolved by fixing the boundary condition predicate.
  • Off[message] switches off the message; On[message] switches it on. For example: Off[NDSolve::bcnop].

Examples

Basic Examples  (1)

The region is given with a bound of . One DirichletCondition, however, has a predicate at that is not on the boundary of the region:

Wolfram Language code: NDSolve[{Laplacian[u[x, y], {x, y}] == 1, DirichletCondition[u[x, y] == 0, x == -1], DirichletCondition[u[x, y] == 0, y == 0]}, u, {x, y}∈Rectangle[{0, 0}, {1, 1}]]

The DirichletCondition needs to be on the boundary of the region:

Wolfram Language code: NDSolve[{Laplacian[u[x, y], {x, y}] == 1, DirichletCondition[u[x, y] == 0, x == 1], DirichletCondition[u[x, y] == 0, y == 0]}, u, {x, y}∈Rectangle[{0, 0}, {1, 1}]]