he stricly lower triangular part (if
          UPLO = 'U') or stricly upper triangular part (if
          UPLO = 'L') is not referenced.

  LDB     INTEGER
          The leading dimension of array B.  LDB &gt;= MAX(1,N).

  Q       (input) DOUBLE PRECISION array, dimension (LDQ,N)
          If FACT = 'N' or 'D', the leading N-by-N upper triangular
          part (if UPLO = 'U') or lower triangular part (if UPLO =
          'L') of this array must contain the upper triangular part
          or lower triangul