+++ /dev/null
-#include "f2c.h"
-
-#ifdef KR_headers
-extern VOID sig_die();
-VOID c_div(c, a, b)
-complex *a, *b, *c;
-#else
-extern void sig_die(char*,int);
-void c_div(complex *c, complex *a, complex *b)
-#endif
-{
- double ratio, den;
- double abr, abi, cr;
-
- if( (abr = b->r) < 0.)
- abr = - abr;
- if( (abi = b->i) < 0.)
- abi = - abi;
- if( abr <= abi )
- {
- if(abi == 0) {
-#ifdef IEEE_COMPLEX_DIVIDE
- float af, bf;
- af = bf = abr;
- if (a->i != 0 || a->r != 0)
- af = 1.;
- c->i = c->r = af / bf;
- return;
-#else
- sig_die("complex division by zero", 1);
-#endif
- }
- ratio = (double)b->r / b->i ;
- den = b->i * (1 + ratio*ratio);
- cr = (a->r*ratio + a->i) / den;
- c->i = (a->i*ratio - a->r) / den;
- }
-
- else
- {
- ratio = (double)b->i / b->r ;
- den = b->r * (1 + ratio*ratio);
- cr = (a->r + a->i*ratio) / den;
- c->i = (a->i - a->r*ratio) / den;
- }
- c->r = cr;
- }