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Annotation of researchv10no/libF77/pow_zz.c, revision 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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