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nicomcof.c: xmu used to calculate trap integration coefficient

This commit is contained in:
h_vogt 2013-06-09 11:06:05 +02:00 committed by rlar
parent 6ce0412690
commit e4921933ba
1 changed files with 8 additions and 4 deletions
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12
src/maths/ni/nicomcof.c
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@ -7,6 +7,12 @@ Author: 1985 Thomas L. Quarles
#include "ngspice/cktdefs.h"
#include "ngspice/sperror.h"
/* xmu=0: Backward Euler
* xmu=0.5: trapezoidal (standard)
* xmu=0.48: good damping of current ringing, e.g. in R.O.s.
*/
#define xmu 0.5
int
NIcomCof(CKTcircuit *ckt)
@ -35,10 +41,8 @@ NIcomCof(CKTcircuit *ckt)
break;
case 2:
ckt->CKTag[0]=1.0/ckt->CKTdelta/(1.0-0.5) ;
ckt->CKTag[1]=0.5/(1.0 - 0.5) ;
/* above lines should have 'xmu' instead of .5 eventually */
/* (in all three places) */
ckt->CKTag[0] = 1.0 / ckt->CKTdelta / (1.0 - xmu);
ckt->CKTag[1] = xmu / (1.0 - xmu);
break;
default: