ray, dimension (LDR,N)
          On entry with UPLO = 'U', the leading N-by-N upper
          triangular part of this array must contain the upper
          triangular part of the symmetric matrix R.
          On entry with UPLO = 'L', the leading N-by-N lower
          triangular part of this array must contain the lower
          triangular part of the symmetric matrix R.
          On exit, the leading N-by-N upper triangular part (if
          UPLO = 'U'), or lower triangular part (if UPLO = 'L'), of
   