petsc4py.typing.NormTypeSpec#
- petsc4py.typing.NormTypeSpec = petsc4py.PETSc.NormType | None#
Norm type specification.
Possible values include:
NormType.NORM_1The 1-norm: Σₙ abs(xₙ) for vectors, maxₙ (Σᵢ abs(xₙᵢ)) for matrices.NormType.NORM_2The 2-norm: √(Σₙ xₙ²) for vectors, largest singular values for matrices.NormType.NORM_INFINITYThe ∞-norm: maxₙ abs(xₙ) for vectors, maxᵢ (Σₙ abs(xₙᵢ)) for matrices.NormType.NORM_FROBENIUSThe Frobenius norm: same as 2-norm for vectors, √(Σₙᵢ xₙᵢ²) for matrices.NormType.NORM_1_AND_2Compute bothNormType.NORM_1andNormType.NORM_2.NoneasNormType.NORM_2for vectors,NormType.NORM_FROBENIUSfor matrices.
See also