OOF2: The Manual
Invariant — Invariants of vectors and tensors.
Subclasses are listed as they appear in the GUI and (in parentheses) as they appear in scripts.
Magnitude) -- Magnitude (L2 or Frobenius norm) of a vector or tensor, absolute value of a scalar.
MatrixTrace) -- Trace of a symmetric tensor.
Determinant) -- Determinant of a symmetric tensor.
SecondInvariant) -- Second invariant of a symmetric tensor.
Deviator) -- Magnitude of deviatoric part of a symmetric tensor.
Eigenvalue) -- Eigenvalue of a symmetric tensor.
Objects of the
Invariant class are used by
classes to determine what quantity to compute. Invariants are
quantities, such as the magnitude of a vector or the determinate
of a tensor, that don't depend on a choice of coordinate system.