      factorization, and the relevant elements above the
          diagonal contain the trailing components (the vectors v,
          see Method) of the elementary reflectors used in the
          factorization.

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

  B       (input/output) DOUBLE PRECISION array, dimension (LDB,M)
          On entry, the leading L-by-M part of this array must
          contain the matrix B.
          On exit, the leading L-by-M part of this ar