his array
          contains the matrix YB.

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

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

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

  YQ      (output) DOUBLE PRECISION array, dimension (LDYQ,2*NB)
          On exit, the leading N-by-(2*NB) part of this