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NDSolve::lsopt NDSolveValue::lsopt ParametricNDSolve::lsopt ParametricNDSolveValue::lsopt

NDSolve::lsopt NDSolveValue::lsopt ParametricNDSolve::lsopt ParametricNDSolveValue::lsopt

Details

  • This message is generated when the value of the indicated option does not have one of the expected forms.
  • Off[message] switches off the message; On[message] switches it on. For example: Off[NDSolve::lsopt].

Examples

Basic Examples  (1)

An error occurs because a list with one element is not a valid value for the MinPoints option when there are two spatial variables:

Wolfram Language code: NDSolve[{D[u[x, y, t], t] == D[u[x, y, t], x, x] + D[u[x, y, t], y, y], u[x, y, 0] == Exp[-10 x ^ 2], u[1, y, t] == Exp[-10], u[-1, y, t] == Exp[-10], u[x, 1, t] == Exp[-10 x ^ 2], u[x, -1, t] == Exp[-10 x ^ 2]}, u, {x, -1, 1}, {y, -1, 1}, {t, 2}, Method -> {"MethodOfLines", "SpatialDiscretization" -> {"TensorProductGrid", "MinPoints" -> {10}}}]

"MinPoints" should be a single number, not a list. Changing {10} to 10 resolves the issue:

Wolfram Language code: NDSolve[{D[u[x, y, t], t] == D[u[x, y, t], x, x] + D[u[x, y, t], y, y], u[x, y, 0] == Exp[-10 x ^ 2], u[1, y, t] == Exp[-10], u[-1, y, t] == Exp[-10], u[x, 1, t] == Exp[-10 x ^ 2], u[x, -1, t] == Exp[-10 x ^ 2]}, u, {x, -1, 1}, {y, -1, 1}, {t, 2}, Method -> {"MethodOfLines", "SpatialDiscretization" -> {"TensorProductGrid", "MinPoints" -> 10}}]