| #include "f2c.h" |
| |
| #ifdef KR_headers |
| extern VOID sig_die(); |
| VOID z_div(c, a, b) doublecomplex *a, *b, *c; |
| #else |
| extern void sig_die(char*, int); |
| void z_div(doublecomplex *c, doublecomplex *a, doublecomplex *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) |
| sig_die("complex division by zero", 1); |
| ratio = 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 = 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; |
| } |