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Annotation of 43BSD/usr.lib/libF77/pow_zz.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)pow_zz.c    5.1     6/7/85
        !             7:  */
        !             8: 
        !             9: #include "complex"
        !            10: 
        !            11: pow_zz(r,a,b)
        !            12: dcomplex *r, *a, *b;
        !            13: {
        !            14: double logr, logi, x, y;
        !            15: double log(), exp(), cos(), sin(), atan2(), cabs();
        !            16: 
        !            17: logr = log( cabs(a->dreal, a->dimag) );
        !            18: logi = atan2(a->dimag, a->dreal);
        !            19: 
        !            20: x = exp( logr * b->dreal - logi * b->dimag );
        !            21: y = logr * b->dimag + logi * b->dreal;
        !            22: 
        !            23: r->dreal = x * cos(y);
        !            24: r->dimag = x * sin(y);
        !            25: }

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