sqrtder.c

spice中支持多层次元件模型仿真的可单独运行的插件源码

/**********
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"

/*
 * SqrtDeriv computes the partial derivatives of the sqrt
 * function where the argument to the function is itself a
 * function of three variables p, q, and r.
 */

void
SqrtDeriv(new, old)
Dderivs *new, *old;
{

Dderivs temp;

EqualDeriv(&temp, old);
new->value = sqrt(temp.value);
if (temp.value == 0.0)
{
new->d1_p = 0.0;
new->d1_q = 0.0;
new->d1_r = 0.0;
new->d2_p2 = 0.0;
new->d2_q2 = 0.0;
new->d2_r2 = 0.0;
new->d2_pq = 0.0;
new->d2_qr = 0.0;
new->d2_pr = 0.0;
new->d3_p3 = 0.0;
new->d3_q3 = 0.0;
new->d3_r3 = 0.0;
new->d3_p2r = 0.0;
new->d3_p2q = 0.0;
new->d3_q2r = 0.0;
new->d3_pq2 = 0.0;
new->d3_pr2 = 0.0;
new->d3_qr2 = 0.0;
new->d3_pqr = 0.0;
}
else
{
new->d1_p = 0.5*temp.d1_p/new->value;
new->d1_q = 0.5*temp.d1_q/new->value;
new->d1_r = 0.5*temp.d1_r/new->value;
new->d2_p2 = 0.5/new->value*(temp.d2_p2 -0.5 * temp.d1_p * temp.d1_p/ temp.value);
new->d2_q2 = 0.5/new->value*(temp.d2_q2 -0.5 * temp.d1_q * temp.d1_q/ temp.value);
new->d2_r2 = 0.5/new->value*(temp.d2_r2 -0.5 * temp.d1_r * temp.d1_r/ temp.value);
new->d2_pq = 0.5/new->value*(temp.d2_pq -0.5 * temp.d1_p * temp.d1_q/ temp.value);
new->d2_qr = 0.5/new->value*(temp.d2_qr -0.5 * temp.d1_q * temp.d1_r/ temp.value);
new->d2_pr = 0.5/new->value*(temp.d2_pr -0.5 * temp.d1_p * temp.d1_r/ temp.value);
new->d3_p3 = 0.5*(temp.d3_p3/new->value - 0.5/(temp.value*new->value)*(-1.5/temp.value*
		temp.d1_p*temp.d1_p*temp.d1_p + temp.d1_p*temp.d2_p2 + 
		temp.d1_p*temp.d2_p2 + temp.d1_p* temp.d2_p2));
new->d3_q3 = 0.5*(temp.d3_q3/new->value - 0.5/(temp.value*new->value)*(-1.5/temp.value*
		temp.d1_q*temp.d1_q*temp.d1_q + temp.d1_q*temp.d2_q2 + 
		temp.d1_q*temp.d2_q2 + temp.d1_q* temp.d2_q2));
new->d3_r3 = 0.5*(temp.d3_r3/new->value - 0.5/(temp.value*new->value)*(-1.5/temp.value*
		temp.d1_r*temp.d1_r*temp.d1_r + temp.d1_r*temp.d2_r2 + 
		temp.d1_r*temp.d2_r2 + temp.d1_r* temp.d2_r2));
new->d3_p2r = 0.5*(temp.d3_p2r/new->value - 0.5/(temp.value*new->value)*(-1.5/temp.value*
		temp.d1_p*temp.d1_p*temp.d1_r + temp.d1_p*temp.d2_pr + 
		temp.d1_p*temp.d2_pr + temp.d1_r* temp.d2_p2));
new->d3_p2q = 0.5*(temp.d3_p2q/new->value - 0.5/(temp.value*new->value)*(-1.5/temp.value*
		temp.d1_p*temp.d1_p*temp.d1_q + temp.d1_p*temp.d2_pq + 
		temp.d1_p*temp.d2_pq + temp.d1_q* temp.d2_p2));
new->d3_q2r = 0.5*(temp.d3_q2r/new->value - 0.5/(temp.value*new->value)*(-1.5/temp.value*
		temp.d1_q*temp.d1_q*temp.d1_r + temp.d1_q*temp.d2_qr + 
		temp.d1_q*temp.d2_qr + temp.d1_r* temp.d2_q2));
new->d3_pq2 = 0.5*(temp.d3_pq2/new->value - 0.5/(temp.value*new->value)*(-1.5/temp.value*
		temp.d1_q*temp.d1_q*temp.d1_p + temp.d1_q*temp.d2_pq + 
		temp.d1_q*temp.d2_pq + temp.d1_p* temp.d2_q2));
new->d3_pr2 = 0.5*(temp.d3_pr2/new->value - 0.5/(temp.value*new->value)*(-1.5/temp.value*
		temp.d1_r*temp.d1_r*temp.d1_p + temp.d1_r*temp.d2_pr + 
		temp.d1_r*temp.d2_pr + temp.d1_p* temp.d2_r2));
new->d3_qr2 = 0.5*(temp.d3_qr2/new->value - 0.5/(temp.value*new->value)*(-1.5/temp.value*
		temp.d1_r*temp.d1_r*temp.d1_q + temp.d1_r*temp.d2_qr + 
		temp.d1_r*temp.d2_qr + temp.d1_q* temp.d2_r2));
new->d3_pqr = 0.5*(temp.d3_pqr/new->value - 0.5/(temp.value*new->value)*(-1.5/temp.value*
		temp.d1_p*temp.d1_q*temp.d1_r + temp.d1_p*temp.d2_qr + 
		temp.d1_q*temp.d2_pr + temp.d1_r* temp.d2_pq));
		}
		}