code: public /**/double quality() {
          if (is64) {
              return DecompositionFactory_DDRM.quality((DMatrixRMaj)mat, (EigenDecomposition_F64)eig);
          } else {
              return DecompositionFactory_FDRM.quality((FMatrixRMaj)mat, (EigenDecomposition_F32)eig);
          }
      }
docs: <p>
  Computes the quality of the computed decomposition.  A value close to or less than 1e-15
  is considered to be within machine precision.
  </p>
  
  <p>
  This function must be called before the original matrix has been modified or else it will
  produce meaningless results.
  </p>
  
  @return Quality of the decomposition.