computes the quality using diagonal elements the triangular r matrix in the qr decomposition . concode_field_sep BlockMatrix64F QR concode_elem_sep QRDecompositionHouseholder_B64 decomp concode_field_sep void invert concode_elem_sep void solve concode_elem_sep boolean modifiesA concode_elem_sep boolean setA concode_elem_sep boolean modifiesB