f this array
          contains the matrix XQ.

  LDXQ    INTEGER
          The leading dimension of the array XQ.  LDXQ &gt;= MAX(1,N).

  YA      (output) DOUBLE PRECISION array, dimension (LDYA,2*NB)
          On exit, the leading (K+N)-by-(2*NB) part of this array
          contains the matrix YA.

  LDYA    INTEGER
          The leading dimension of the array YA. LDYA &gt;= MAX(1,K+N).

  YB      (output) DOUBLE PRECISION array, dimension (LDYB,2*NB)
          On exit, the leading N-by-(2*NB) part of t