45 lines
840 B
C
45 lines
840 B
C
#include "f2c.h"
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#ifdef KR_headers
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extern VOID sig_die();
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VOID z_div(c, a, b) doublecomplex *a, *b, *c;
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#else
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extern void sig_die(char*, int);
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void z_div(doublecomplex *c, doublecomplex *a, doublecomplex *b)
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#endif
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{
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double ratio, den;
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double abr, abi, cr;
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if( (abr = b->r) < 0.)
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abr = - abr;
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if( (abi = b->i) < 0.)
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abi = - abi;
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if( abr <= abi )
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{
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if(abi == 0) {
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#ifdef IEEE_COMPLEX_DIVIDE
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if (a->i != 0 || a->r != 0)
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abi = 1.;
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c->i = c->r = abi / abr;
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return;
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#else
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sig_die("complex division by zero", 1);
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#endif
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}
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ratio = b->r / b->i ;
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den = b->i * (1 + ratio*ratio);
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cr = (a->r*ratio + a->i) / den;
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c->i = (a->i*ratio - a->r) / den;
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}
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else
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{
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ratio = b->i / b->r ;
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den = b->r * (1 + ratio*ratio);
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cr = (a->r + a->i*ratio) / den;
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c->i = (a->i - a->r*ratio) / den;
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}
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c->r = cr;
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}
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