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Annotation of researchv10no/libF77/pow_zz.c, revision 1.1.1.1

1.1       root        1: #include "f2c.h"
                      2: 
                      3: #ifdef KR_headers
                      4: double log(), exp(), cos(), sin(), atan2(), f__cabs();
                      5: VOID pow_zz(r,a,b) doublecomplex *r, *a, *b;
                      6: #else
                      7: #undef abs
                      8: #include "math.h"
                      9: extern double f__cabs(double,double);
                     10: void pow_zz(doublecomplex *r, doublecomplex *a, doublecomplex *b)
                     11: #endif
                     12: {
                     13: double logr, logi, x, y;
                     14: 
                     15: logr = log( f__cabs(a->r, a->i) );
                     16: logi = atan2(a->i, a->r);
                     17: 
                     18: x = exp( logr * b->r - logi * b->i );
                     19: y = logr * b->i + logi * b->r;
                     20: 
                     21: r->r = x * cos(y);
                     22: r->i = x * sin(y);
                     23: }

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