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Annotation of 43BSD/usr.lib/libF77/pow_zz.c, revision 1.1.1.1

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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