38 lines
666 B
C
38 lines
666 B
C
|
|
#include <math.h>
|
|
#include "complex.h"
|
|
#define NMAX 100
|
|
#define ZERO Complex(0.0,0.0)
|
|
#define ONE Complex(1.0,0.0)
|
|
|
|
void fixrts(d,m)
|
|
float d[];
|
|
int m;
|
|
{
|
|
void zroots();
|
|
int i,j,polish;
|
|
fcomplex a[NMAX],roots[NMAX];
|
|
|
|
a[m]=ONE;
|
|
for (j=m-1;j>=0;j--)
|
|
a[j]=Complex(-d[m-j],0.0);
|
|
polish=1;
|
|
zroots(a,m,roots,polish);
|
|
for (j=1;j<=m;j++)
|
|
if (Cabs(roots[j]) > 1.0)
|
|
roots[j]=Cdiv(ONE,Conjg(roots[j]));
|
|
a[0]=Csub(ZERO,roots[1]);
|
|
a[1]=ONE;
|
|
for (j=2;j<=m;j++) {
|
|
a[j]=ONE;
|
|
for (i=j;i>=2;i--)
|
|
a[i-1]=Csub(a[i-2],Cmul(roots[j],a[i-1]));
|
|
a[0]=Csub(ZERO,Cmul(roots[j],a[0]));
|
|
}
|
|
for (j=0;j<=m-1;j++)
|
|
d[m-j] = -a[j].r;
|
|
}
|
|
#undef NMAX
|
|
#undef ZERO
|
|
#undef ONE
|