linux平台下类似著名的电路板作图软件 Spice的源代码

				/**********				Copyright 1990 Regents of the University of California.  All rights reserved.				Author: 1989 Jaijeet S. Roychowdhury				**********/								#include "spice.h"				#include "distodef.h"				#include "suffix.h"								/*				 * PlusDeriv computes the partial derivatives of the addition				 * function where the arguments to the function are				 * functions of three variables p, q, and r.				 */								void				PlusDeriv(new, old1, old2)				Dderivs *new, *old1, *old2;				{								new->value = old1->value + old2->value;				new->d1_p = old1->d1_p  + old2->d1_p ;				new->d1_q = old1->d1_q  + old2->d1_q ;				new->d1_r = old1->d1_r  + old2->d1_r ;				new->d2_p2 = old1->d2_p2  + old2->d2_p2 ;				new->d2_q2 = old1->d2_q2  + old2->d2_q2 ;				new->d2_r2 = old1->d2_r2  + old2->d2_r2 ;				new->d2_pq = old1->d2_pq  + old2->d2_pq ;				new->d2_qr = old1->d2_qr  + old2->d2_qr ;				new->d2_pr = old1->d2_pr  + old2->d2_pr ;				new->d3_p3 = 						old1->d3_p3  						+ old2->d3_p3 ;				new->d3_q3 = 						old1->d3_q3  						+ old2->d3_q3 ;				new->d3_r3 = 						old1->d3_r3  						+ old2->d3_r3 ;				new->d3_p2r = 						old1->d3_p2r  						+ old2->d3_p2r ;				new->d3_p2q = 						old1->d3_p2q  						+ old2->d3_p2q ;				new->d3_q2r = 						old1->d3_q2r  						+ old2->d3_q2r ;				new->d3_pq2 = 						old1->d3_pq2  						+ old2->d3_pq2 ;				new->d3_pr2 = 						old1->d3_pr2  						+ old2->d3_pr2 ;				new->d3_qr2 = 						old1->d3_qr2  						+ old2->d3_qr2 ;				new->d3_pqr = 						old1->d3_pqr  						+ old2->d3_pqr ;						}