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SquareMatrix.C
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25 
26 #include "SquareMatrix.H"
27 #include "labelList.H"
28 
29 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
30 
31 template<class Type>
32 Foam::scalar Foam::detDecomposed
33 (
34  const SquareMatrix<Type>& matrix,
35  const label sign
36 )
37 {
38  Type diagProduct = pTraits<Type>::one;
39 
40  for (label i=0; i<matrix.m(); i++)
41  {
42  diagProduct *= matrix(i, i);
43  }
44 
45  return sign*diagProduct;
46 }
47 
48 
49 template<class Type>
50 Foam::scalar Foam::det(const SquareMatrix<Type>& matrix)
51 {
52  SquareMatrix<Type> matrixTmp = matrix;
53 
54  labelList pivotIndices(matrix.m());
55  label sign;
56  LUDecompose(matrixTmp, pivotIndices, sign);
57 
58  return detDecomposed(matrixTmp, sign);
59 }
60 
61 
62 template<class Type>
63 Foam::scalar Foam::det(SquareMatrix<Type>& matrix)
64 {
65  labelList pivotIndices(matrix.m());
66  label sign;
67  LUDecompose(matrix, pivotIndices, sign);
68 
69  return detDecomposed(matrix, sign);
70 }
71 
72 
73 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensionedScalar sign(const dimensionedScalar &ds)
scalar detDecomposed(const SquareMatrix< Type > &, const label sign)
Return the LU decomposed SquareMatrix det.
intWM_LABEL_SIZE_t label
A label is an int32_t or int64_t as specified by the pre-processor macro WM_LABEL_SIZE.
Definition: label.H:59
void LUDecompose(scalarSquareMatrix &matrix, labelList &pivotIndices)
LU decompose the matrix with pivoting.
dimensionedScalar det(const dimensionedSphericalTensor &dt)
List< label > labelList
A List of labels.
Definition: labelList.H:56