23 new->
value = old1->value + old2->value;
24 new->d1_p = old1->d1_p + old2->d1_p ;
25 new->d1_q = old1->d1_q + old2->d1_q ;
26 new->d1_r = old1->d1_r + old2->d1_r ;
27 new->d2_p2 = old1->d2_p2 + old2->d2_p2 ;
28 new->d2_q2 = old1->d2_q2 + old2->d2_q2 ;
29 new->d2_r2 = old1->d2_r2 + old2->d2_r2 ;
30 new->d2_pq = old1->d2_pq + old2->d2_pq ;
31 new->d2_qr = old1->d2_qr + old2->d2_qr ;
32 new->d2_pr = old1->d2_pr + old2->d2_pr ;
void PlusDeriv(Dderivs *new, Dderivs *old1, Dderivs *old2)