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30 lines
549 B
C
30 lines
549 B
C
#include "f2c.h"
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#ifdef KR_headers
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double log(), exp(), cos(), sin(), atan2(), f__cabs();
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VOID pow_zz(r,a,b) doublecomplex *r, *a, *b;
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#else
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#undef abs
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#include "math.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern double f__cabs(double,double);
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void pow_zz(doublecomplex *r, doublecomplex *a, doublecomplex *b)
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#endif
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{
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double logr, logi, x, y;
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logr = log( f__cabs(a->r, a->i) );
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logi = atan2(a->i, a->r);
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x = exp( logr * b->r - logi * b->i );
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y = logr * b->i + logi * b->r;
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r->r = x * cos(y);
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r->i = x * sin(y);
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}
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#ifdef __cplusplus
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}
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#endif
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