sums up the square of each element in the matrix . this is equivalent to the frobenius norm squared . concode_field_sep PlaceHolder placeHolder concode_field_sep void subvector concode_elem_sep double diffNormP1 concode_elem_sep DenseMatrix64F pivotMatrix concode_elem_sep DenseMatrix64F copyChangeRow concode_elem_sep DenseMatrix64F createReflector concode_elem_sep DenseMatrix64F createReflector concode_elem_sep double diffNormF concode_elem_sep double qualityTriangular concode_elem_sep double diffNormF_fast concode_elem_sep void addIdentity concode_elem_sep double diagProd concode_elem_sep DenseMatrix64F copyTriangle concode_elem_sep DenseMatrix64F[] splitIntoVectors