hilated elements are set to zero.

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

  C       (input/output) DOUBLE PRECISION array, dimension (LDC,N)
          On entry, the leading P-by-N part of this array must
          contain the output matrix C to be transformed.
          On exit, the leading P-by-N part of this array contains
          the transformed output matrix C * U.
          The annihilated elements are set to zero.

  LDC     INTEGER
          The leading 