24 lines
453 B
C
24 lines
453 B
C
#ifndef lint
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static char sccsid[] = "@(#)pow_zz.c 1.1 94/10/31 SMI"; /* from UCB 1.1" */
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#endif
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/*
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*/
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#include "complex.h"
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pow_zz(r,a,b)
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dcomplex *r, *a, *b;
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{
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double logr, logi, x, y;
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double log(), exp(), cos(), sin(), atan2(), hypot();
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logr = log( hypot(a->dreal, a->dimag) );
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logi = atan2(a->dimag, a->dreal);
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x = exp( logr * b->dreal - logi * b->dimag );
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y = logr * b->dimag + logi * b->dreal;
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r->dreal = x * cos(y);
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r->dimag = x * sin(y);
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}
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