Function LDU

LDU(
    L: ReadonlyMat2,
    D: ReadonlyMat2,
    U: ReadonlyMat2,
    a: ReadonlyMat2,
): ReadonlyMat2[]
Returns L, D and U matrices (Lower triangular, Diagonal and Upper triangular) by factorizing the input matrix
Parameters
- L: ReadonlyMat2
  the lower triangular matrix
- D: ReadonlyMat2
  the diagonal matrix
- U: ReadonlyMat2
  the upper triangular matrix
- a: ReadonlyMat2
  the input matrix to factorize
Returns ReadonlyMat2[]