DLAUU2 computes the product U * U**T or L**T * L, where the triangular


 factor U or L is stored in the upper or lower triangular part of


 the array A.


 If UPLO = 'U' or 'u' then the upper triangle of the result is stored,


 overwriting the factor U in A.


 If UPLO = 'L' or 'l' then the lower triangle of the result is stored,


 overwriting the factor L in A.


 This is the unblocked form of the algorithm, calling Level 2 BLAS.

UPLO

          UPLO is CHARACTER*1


          Specifies whether the triangular factor stored in the array A


          is upper or lower triangular:


          = 'U':  Upper triangular


          = 'L':  Lower triangular

N

          N is INTEGER


          The order of the triangular factor U or L.  N >= 0.

A

          A is DOUBLE PRECISION array, dimension (LDA,N)


          On entry, the triangular factor U or L.


          On exit, if UPLO = 'U', the upper triangle of A is


          overwritten with the upper triangle of the product U * U**T;


          if UPLO = 'L', the lower triangle of A is overwritten with


          the lower triangle of the product L**T * L.

LDA

          LDA is INTEGER


          The leading dimension of the array A.  LDA >= max(1,N).

INFO

          INFO is INTEGER


          = 0: successful exit


          < 0: if INFO = -k, the k-th argument had an illegal value

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December 2016