span><code>       A is COMPLEX array, dimension ( LDA, N ).
        Before entry with UPLO = &#39;U&#39; or &#39;u&#39;, the leading n by n
        upper triangular part of the array A must contain the upper
        triangular matrix and the strictly lower triangular part of
        A is not referenced.
        Before entry with UPLO = &#39;L&#39; or &#39;l&#39;, the leading n by n
        lower triangular part of the array A must contain the lower
        triangular matrix and the strictly upper triangular