On entry, if TYPEG = 'R', the leading (P-K)-by-K part of
          this array must contain the matrix A2 as returned by
          MB02CU.

  LDA2    INTEGER
          The leading dimension of the array A2.
          If P = K,                  LDA2 &gt;= 1;
          If P &gt; K and (TYPEG = 'D' or TYPEG = 'C'),
                                     LDA2 &gt;= MAX(1,K);
          if P &gt; K and TYPEG = 'R',  LDA2 &gt;= P-K.

  B       (input)  DOUBLE PRECISION array,
          if TYPEG = 'D'  or  TYPEG = 'C'